Paraconsistent Differential Calculus (Part I): First-Order Paraconsistent Derivative ()

João Inácio Da Silva Filho

Group of Applied Paraconsistent Logic, Santa Cecília University-UNISANTA, Santos, Brazil.

**DOI: **10.4236/am.2014.56086
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Group of Applied Paraconsistent Logic, Santa Cecília University-UNISANTA, Santos, Brazil.

A type of Inconsistent Mathematics structured on Paraconsistent Logic (PL) and that has, as the main purpose, the study of common mathematical objects such as sets, numbers and functions, where some contradictions are allowed, is called Paraconsistent Mathematics. The PL is a non-Classical logic and its main property is to present tolerance for contradiction in its fundamentals without the invalidation of the conclusions. In this paper (part 1), we use the PL in its annotated form, denominated Paraconsistent Annotated Logic with annotation of two values—PAL2v for present a first-order Paraconsistent Derivative. The PAL2v has, in its representation, an associated lattice FOUR based on Hasse Diagram. This PAL2v-Lattice allows development of a Para-consistent Differential Calculus based on fundamentals and equations obtained by geometric interpretations. In this first article it is presented some examples applying derivatives of first-order with the concepts of Paraconsistent Mathematics. In the second part of this work we will show the Paraconsistent Derivative of second-order with application examples.

Keywords

Paraconsistent Logic, Paraconsistent Annotated Logic, Paraconsistent Mathematics, Paraconsistent Differential Calculus

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Da Silva Filho, J. I. (2014) Paraconsistent Differential Calculus (Part I): First-Order Paraconsistent Derivative. *Applied Mathematics*, **5**, 904-916. doi: 10.4236/am.2014.56086.

1. Introduction

There is no doubt that one of the greatest achievements in the area of applied mathematics was the Differential Calculus. The construction of Differential Calculus demonstrates the genius of Newton and Leibniz, as well as other physicists, philosophers and mathematicians who preceded or succeeded them. However, in Infinitesimal Calculus, when using the infinitesimal ε we know that even being infinitely small it is not zero, but regardless of this fact that ε simply disappears at the end of calculation [1] - [4] . This shows that reasoning in Differential Calculus is done with conflicting information and in these calculations ε is despised so that it does not cause conflicts in the conclusions [5] .

The Classical Logic, which emerged in Greece with the ancient philosophers, brings in its fundamentals bi- nary strict laws that do not consider the existence of contradiction, and therefore do not respond well to certain conditions frequently encountered in the real world. From this, it appears that there is the need of finding new ways to design models of physical systems which may prove more efficiency to respond to analysis, particularly those dealing with boundary extreme conditions that are based on information signals which can be contradic- tory [6] . Responding to this problem, today there are many logics different from the Classical aiming to structure models that respond adequately the information from an imperfect world represented by the data information that could be incomplete and/or contradictory [6] - [8] . These logics are known as non-Classical and bring in its fundamental principles that somehow violate the laws that underlie the Classical Logic [6] [9] [10] . Mathemati- cal theories supported by these non-Classical logics that, in certain aspects, contradict the rigid binary laws of Classical Logic, have been quite effective in various fields of knowledge. The Paraconsistent Logic (PL), which originates mathematics used in this work belongs to the class of non-classical logics and presents in its founda- tion some tolerance at contradiction that occurs, without invalidating the conclusions. Its extended form, called Para-consistent Annotated Logic (PAL), has in its representation as an associated Lattice that allows the devel- opment of algorithmic techniques and direct applications, and that has brought promising results [6] [9] - [12] .

In this paper, we use the PAL in its structural form in which an annotation of two values is used to perform a type of Differential Paraconsistent Calculus applied in solving problem related to physical systems. The PAL treating information signals in its special form, called Paraconsistent Logic with annotation of two values (PAL2v), allows extracting from the Newton’s quotient, found in the deduction of the differential calculus. All the information is necessary and sufficient to effect the derivative of first- and second-order and apply them to physical systems with good results without ignoring the action of the infinitesimal [6] [12] .

2. A Non-Classical Paraconsistent Logic

Into the family of the non-Classical logics we have Paraconsistent logics whose main feature is the revocation of the principle of non-contradiction. In formal way [10] [11] , we can define Paraconsistent Logic as Any deduc- tive theory T is based on a given logic L, and we suppose that all logics considered here contain a connective for negation, symbolized. If two formulas of the language of T, one of which is the negation of the other, are both theorems of T (i.e. for some formula A, both A and A are theorems of T), then T is said to be inconsistent, oth- erwise T is consistent. If all formulas of the language of T (or all closed formulas) are theorems of T, then T is called trivial; otherwise it is said to be non-trivial. A logic L is paraconsistent if it can be the underlying logic of inconsistent, but non-trivial theories. The usual systems of logic, for instance classical and intuitionistic logics, are not paraconsistent. If the theory T is inconsistent and non-trivial, then T is called a paraconsistent theory.

Therefore, Paraconsistent Logic is a non-Classical Logic repealing the principle of non-contradiction and al- lows the processing of conflicting information in its theoretical structure. Among the precursors of Paraconsis- tent Logic is the polish logician J. Lukasiewicz and the Russian philosopher N.A. Vasilev that independently suggested the possibility of a logic that restrict, for example, the principle of contradiction. The initial systems of Paraconsistent Logic containing all logical levels, involving propositional calculations, of predicate and de- scriptions, as well as logic from superior order is due to N.C.A. Costa (1954 onwards) [6] [13] [14] . Currently there are even paraconsistent systems of theories of sets, strictly stronger than the classic, being then considered as paraconsistent subsystems [15] .

2.1. Paraconsistent Annotated Logic PAL

Paraconsistent Annotated Logic―PAL, also known as evidential logic ετ, belongs to the family of Paraconsis- tent Logics and can be represented in a particular way, through a four-vertices Lattice (Lattice FOUR). In intuitive mode the constants of annotation represented in its vertices will give connotations of Logical states related at propositions P [6] [12] [15] .

2.2. Paraconsistent Annotated Logic with Annotation of Twos Values―PAL2v

An atomic proposition of PAL-logic language can be represented by, where μ and λ are elements in the closed interval [0,1] what belongs to the set of real numbers [6] [10] . These two values are considered in- formation Signals and called of degrees of evidence. Among several intuitive readings, , can be read as: µ is the evidence favorable to proposition P and λ the unfavorable evidence to proposition P.

In [10] and [13] were introduced some terminology. The pair is called constant annotation. Such a pair is an element of [0,1] × [0,1] that sometimes indicated by [0,1]^{2}, where [0,1] indicates the closed unitary real interval. For this set is applied one relation of order, so defined: (where the second order is the usual order of real numbers). Therefore, the unitary square with the relation of order constitutes a Lattice that can symbolize foras seen in Figure 1(a).

Properties:

1) " (Reflexivity).

2) " imply anti-symmetry.

3) " imply transitivity.

4) " there is the Supremum of indicated by

.

5) " there is the Infimum of indicated by

.

6) ".

As proposed in [10] and in [14] , in this work we use the Lattice FOUR (Hasse diagram) for representation of Paraconsistent Annotated Logic. It is possible through a Lattice FOUR of values obtain in the PAL representa- tion, how much the annotation (or evidences), can express the knowledge about a proposition P. As seen in Figure 1(b) for the PAL t and F represent the classical values true and False, respectively, and T denote Incon- sistent, while ^ indetermination. The Lattice can be formed of ordered pairs of values (m, λ), which will form the annotation. In this representation, an operator ~ is fixed: where:.

3. Paraconsistent Geometric Transformations

Geometric Modeling provides a mathematical description of a geometric object―point, line, conic section, sur- face, or a solid. Geometric transformation is very important for computer graphics, enabling us to manipulate the shape, size, and location of the object [16] . A transformation [3] [4] of a non-empty set U in a non-empty set V is a matching T where, every element x of U, associates a single element y = T(x) of V. Is denoted F: U→V the set of elements y for which there is a x such that T(x) = y it is called image of T. The set U it is called domain and the set V it is called against domain of T. The Paraconsistent transformations are initially made in U = V = R^{2}.

Consider that Unitary Square on Cartesian Plane (USCP) (Figure 1) is the Lattice τ with the coordinate sys- tem where the values of the degree of evidence favorable (m) are represented on the x-axis, and the values of the

(a) (b)

Figure 1. (a) Unitary Square on the Cartesian Plane (USCP). (b) Lattice FOUR (Hasse Diagram).

degree of evidence unfavorable (λ) in the y-axis. In this system certain annotation (m, λ) can be identified with the point of the plane in another k system with representation in Hasse Diagram (Figure 2) denominated τ. It is fixed, therefore, a coordinate system for τ and it is defined transformations between USCP and PAL2v-Lattice, which will be the PAL2v-Lattice τ provided with another coordinate system [6] [11] [14] .

The Paraconsistent geometric transformations are made between the USCP-Lattice k (Figure 1), such that PAL2v-Lattice τ (Figure 2) can be obtained from USCP. As shown below, three phases are required to obtain the Paraconsistent transformations. They are: 1) expansion of the scale; 2) rotation; 3) translation the x axis [6] .

1) Expansion

Expansion of the scale consist change of scale enables the change object size.

Consider a point P(x, y) and P'(X, P) the coordinates of the point after scaling [16] . For the change of scale multiplies each point Pi of the object in question by a factor of change of scale horizontally (Sx) and a factor of scaling vertically (Sy). Defining the function T as being:

Is made an increase of the scale at USCP-Lattice k seen in the Figure 1, such that:.

Therefore, being:, the increase in scale of the USCP-Lattice k is given by the first trans- formation:. We have:.

2) Rotation

The mathematical expression of the rotation of an object from the origin a certain angle θ is considered from a point P(xp, yp), such that: and the point P'(Xp, Yp):

. Therefore the function T can be defined as being:

For Paraconsistent transformation is made in the USCP-Lattice k a Rotation of 45˚ relating to the origin, therefore:, then:

and

From;, for a Rotation of 45˚ we have:

. Therefore:

.

3) Translation

Consider a geometric object represented by a set of points Pi belonging to R^{2} [16] . The translation is made by

Figure 2. Paraconsistent geometric transformation.

adding whole amounts to their coordinates. So, be a point P(x, y) which will be carried out an operation of translation and is P' the coordinates of the point after the translation one can define the function T as being: where the entire amounts are dx and dy. Is made in the USCP-Lattice k a Translation on y-axis. Being,; then:

With:, this final transformation is given by:

(1)

Therefore:. And with Equation (1) are converted points of USCP-Lattice k in points into Hasse Diagram or Lattice FOUR, which also represent associative LPA2v-Lattice τ [6] [10] [12] . The first term X_{3} obtained in the ordered pair of the transformation in Equation (1) is called Certainty Degree (D_{C}). Therefore, the Certainty Degree is achieved by:

(2)

where: m Favorable Evidence Degree.

λ Unfavorable Evidence Degree.

Its values, which belong to the set Â vary in closed interval −1 to +1 and are in the horizontal axis of the PAL2v-Lattice τ of values called “Axis of degrees of certainty”.

The second term Y_{3} obtained in the ordered pair of the equation of the transformation (1) is called Contradic- tion Degree (D_{ct}). Therefore, the Contradiction Degree is obtained by:

(3)

The resulting values of D_{ct} belong to set Â, vary on the closed interval +1 and −1 and are exposed on the ver- tical axis of the PAL2v-Lattice τ called “Axis of contradiction degrees”.

In the PAL2v-Lattice τ when D_{C} results in +1 it means that the Paraconsistent logical State (e_{τ}) resulting from paraconsistent analysis is True, and when D_{C} results in −1 it means that it is False. Similarly, when D_{ct} results in +1 means that the Paraconsistent logical State (e_{τ}) resulting from the paraconsistent analysis is Inconsistent T, and when D_{ct} result in −1 means that it is Undetermined ^. Figure 2 shows the steps for Paraconsistent Geome- tric Transformation. It is considered, therefore, that by analyzing the PAL2v-Lattice τ [6] [10] [14] the concept of Paraconsistent logical state (e_{τ}) can be correlated to the fundamental concept of state, as studied in physical science and then extended to the model based on Paraconsistent Logic.

(4)

Or

(5)

where: eτ is the Paraconsistent Logical state.

D_{C} is the Certainty Degree obtained according to the two degrees of Evidence μ and λ.

D_{ct} is the Contradiction Degree found according to the two degrees of Evidence μ and λ.

In a static measurement of observable variables in the physical world, in which is obtained the values of Fa- vorable Evidence Degree (μ) and Unfavorable Evidence Degree (λ) to determine the Certainty Degree (D_{C}) and Contradiction Degree (D_{ct}) is always found a single Paraconsistent Logical State (e_{τ}) related to the two informa- tion signals.

The representation of Observable Variables measured in the physical world and the Paraconsistent Universe represented by PAL2v-Lattice τ can be shown according to the Figure 3.

The Certainty Degree normalized from the Paraconsistent Logical Model is called Resulting Degree of Evi- dence [6] which is calculated by:

(6)

Likewise, the normalized Contradiction Degree from the Paraconsistent Logical Model [17] - [19] is calculated by:

(7)

Figure 3. Representation of Physical World interacting with Paraconsistent Universe consi- dered by PAL2v-Lattice τ.

Paraconsistent Inverse Transformation

The Paraconsistent Logical Model allows the results to be reversible, so once obtained the values of the Certainty Degree (D_{C}) and Contradiction degree (D_{ct}) it is possible to recover the Degrees of Evidence from the equations: From equation (2):

From Equation (3):

From Equation (2):

From Equation (3):

4. Paraconsistent Mathematics

The Newton’s quotient can adapt to a Paraconsistent Logical Model in the form of Paraconsistent mathematical Model will be formed based on the initial concepts of the derivatives [2] [3] [20] .

4.1. Derivative

If a function f is derivable or differentiable [2] [20] [21] so close to each a point of its domain the function will behave approximately as a linear function, so its graph is approximately a straight line. The

slope of this line is the derivative of the function f at the point a, and is represented by: or. In

Calculus for the resolutions of problems of Physics the derivative represents the instantaneous variation of a function [2] [19] . Formally we have: Let I be an interval with more than one point of the set of real numbers and let f be a function of I in, denoted:. If the a point belongs to the interval I, it is said that f is derivable in a if the limit exist and if it is finite. If this is the case, then this limit is called a Derivative of

function f at point a, and is represented by such that:. Considering there was an increase h such that:. The Derivative can be rewritten as: . According to this definition, the Derivative of a function of one variable is de- fined as a limit process.

4.2. Newton’s Quotient

It is considered the Figure 4 below [2] [20] [21] where the tangent line is defined by the graph of a function f in the point P, as that which passes through P and whose slope (angular coefficient on a straight line) is equal to k. Where P is a fixed point and a Q point that approximates P, occupying successive positions Q1, Q2, Q3..., the secant lines will have the positions by PQ1, PQ2, PQ3... The slopes of these secant lines will be increasingly close to the slope of the tangent line. The analytical tool to make Q approach to P consists in making h tend to zero, that is, taking the h values arbitrarily close to 0. In general it is considered that, in the limit, when the two points of intersection with the graph of f converge to the same point P, the slope of the secant line is equal to the tangent. In this case, the slope of secant to the graph of f passing through the points (x, f(x)) e (x_{ }+ h, f(x + h)) is given by the Newton’s quotient:

(8)

If the result takes positive values (negative), becoming closer to zero, it means that the sequence of points Qj is approaching the point P on the right (left). When and the incremental ratio, so the coefficient in the point approaches the finite value k, we say that k is the limit of the incremental ratio with h tending to zero, so is

the derivative of f at the point, and is denoted by:, provided that this limit makes sense

[2] [20] . If no such limit exists, we say that there is not the derivative of f(x) at the point. If the function has a

Figure 4. Graph of a f function at the P point with the tangent line that passes through P and the Qs secants approaching P.

derivative at a point, we say that f is derivable (or differentiable) at this point. Likewise, the equation can be

written as h represents a variation of x, such that: in which is quotient of Newton is:

(9)

Therefore, the Newton’s quotient is defined as the incremental ratio of f with respect to the variable x, at the point x [2] [20] .

4.3. Paraconsistent Differential Calculus

To establish a method of Paraconsistent Differential Calculus where contradictory values will not be despised it is considered initially the Newton’s quotient Equation (8) that can be written as:, or the Equation (9), using the increment of the variable x such that:

It can be applied to the Newton’s quotient a K factor of normalization that aims to put its values within the limits of the PAL2v-Lattice τ, therefore:

(10)

where: K is a normalization Factor, whose action allows the equation to be done as the fundamentals of PAL2v.

With the normalization Factor in equation (10) are identified the degrees of Evidence of PAL2v annotation,

such that: → Favorable Evidence Degree and → Unfavorable Evidence Degree.

In Paraconsistent Logical Model the K value must be estimated so that the values of the degrees of Evidence become established within the fundamentals of PAL2v. For this becomes:. With this condition, in equation (10) the adjustment factor K ensures: and. With the identification of degrees of Evidence in Newton’s quotient adjusted to Paraconsistent Logical Model it is possible to calculate by Equation (2) the Certainty Degree of the Newton’s quotient, such that:

(11)

It is also possible to calculate by Equation (3) the Contradiction Degree of Newton’s quotient, such that:

(12)

In the Paraconsistent Logical Model the value of the K adjustment factor will define Contradiction Degree of the final Newton’s quotient, so its value will indicate where into PAL2v-Lattice τ will be the Paraconsistent Logical State (e_{τ}), defined in the Equation (5).

4.4. Newton Normalization Factor

If in the point considered the maximum value of the function is it is possible then in the adjust- ment of the Newton’s quotient for the Paraconsistent Logical Model to do:. It is verified that, in this case, the degree of contraction of Newton’s quotient calculated by Equation (13) is close to zero. We can adjust the normalization Factor K so that the answers are referenced to the equilibrium point of the PAL2v-Lattice τ called Paraquantum Factor of quantization. This value is an equilibrium constant equivalent to Planck’s constant called Paraquantum Factor of quantization, as seen in [9] [12] [17] . If in adjusting the New- ton’s quotient to the Paraconsistent Logical Model is considered h_{ψ}, then, and:

(13)

where: is the maximum value of the function at the considered point.

K_{N} is the Paraconsistent Newton Normalization Factor

The value of the Paraconsistent Derivative of the first-order in the physical world is obtained through reap- plying of Newton Normalization Factor (K_{N}) in the result of Paraconsistent Newton’s quotient:

(14)

Thus, it is possible for the Paraconsistent Mathematics to be connected to the equilibrium point, defined by the Paraquantum Factor of quantization (h_{ψ}) of the PAL2v-Lattice τ [9] [12] [17] [19] .

The final value of Paraconsistent Derivative depends on the value of variation in x thus it depends on the in- crement of variable x chosen in the calculation.

4.5. Paraconsistent First-Order Derivative

It is verified that the location of the Paraconsistent logical State ε was adjusted in the PAL2v-Lattice τ through the Paraconsistent Newton Normalization Factor (K_{N}) and identifies how it is represented any differentiable function before the mathematical procedure for obtaining the derivative. Thus, for a function of the type

, where n is some positive integer, we have:. With the Paraconsistent

Newton’s quotient, which includes the Paraconsistent Newton Normalization Factor (K_{N}), the analysis will be written as:

(15)

or

(16)

This normalization allows for the function to be identified in the Paraconsistent Newton’s quotient the Evidence Degrees of a Paraconsistent Logical Model, such that:

→ Favorable Evidence Degree and → Unfavorable Evidence Degree

Thus, for the function, the Paraconsistent Newton’s quotient produces the value corresponding to the Certainty Degree (D_{C}), which, as the fundamentals of PAL2v is obtained by Equation (11):

(17)

Similarly, the Equation (12) the Contradiction Degree of the Paraconsistent Newton’s quotient:

(18)

Therefore, the Paraconsistent values extracted from Newton’s quotient adjusted to Paraconsistent Logical Model depends of, that is, the increment of the variable x applied to the calculations.

Figure 5 shows the location of the Paraconsistent Logical state defined in the equilibrium point established by the Paraquantum Factor of quantization (h_{ψ}).

5. Examples of Resolution First-Order Paraconsistent Derivative

In this section it is presented examples of the use of the Paraconsistent Newton’s quotient in the resolution of first-order Derivative for different values of the Variable Increment x.

Example 1

It is wanted a final value of the first-order Paraconsistent Derivative of the function in so

Figure 5. Paraconsistent logical State adjusted in equilibrium point h_{ψ} through the Newton Normalization factor K_{N}.

that the Contradiction Degree of the Newton’s quotient that is near the h_{ψ}, establishes thus a Paraconsistent Log- ical State ε of equilibrium of the PAL2v-Lattice τ.

Resolution: Initially, to form Paraconsistent Newton Normalization Factor it is calculated the maximum value of the function at the point considered, therefore, being:

It is calculated the value of the Paraconsistent Newton Normalization Factor, according to the Equation (13):

For an increment value of the variable x, for example, , Certainty Degree of Paraconsistent New- ton’s quotient is calculated by Equation (19):

The Paraconsistent Newton’s quotient is calculated according to Equations (15) or (16)

Recovering value of Paraconsistent Derivative in the physical world by Equation (14):

Therefore, for these conditions, where the increment of the variable x is the final value of the Pa- raconsistent Derivative of the function in, is:

Decreasing to

The Certainty Degree of Paraconsistent Newton’s quotient calculated by Equation (17) is:

And the Paraconsistent Newton’s quotient calculated according to Equation (16) is:

Recovering the value of Paraconsistent Derivative in the physical world by Equation (14) becomes:

Therefore, for these conditions, where the increment of the variable x is the final value of the Paraconsistent Derivative in, is

Decreasing the value of, for example, , the Certainty Degree of Paraconsistent Newton’s quo- tient is calculated by the Equation (19):

The Paraconsistent Newton’s quotient is calculated according to Equation (16):

Recovering the value of Paraconsistent Derivative in the physical world by Equation (14):

Therefore, for these conditions, where the increment of the variable x is the final value of the Pa- raconsistent Derivative of the function in x=3 is:

Decreasing the value of, for example, for

The Certainty Degree of Paraconsistent Newton’s quotient is calculated by Equation (17):

The Paraconsistent Newton’s quotient is calculated according to Equation (18):

Recovering the value of Paraconsistent Derivative in the physical world by Equation (14):

Therefore, for these conditions, where the increment of the variable x is the final value of the Paraconsistent Derivative of the function in x = 3 is:.

It is verified that the Contraction Degree of Paraconsistent Newton’s quotient obtained by Equation (18) ap- proaches to as the value of decreases. For example;

For:

For:

For:

For:

Example 2

Through Paraconsistent Mathematics originated from the Paraconsistent Logical Model, determine:

1) The equation of the first-order Paraconsistent Derivative of the function.

2) Using a value of the increment of the variable x of, determine the value of the first-order Pa- raconsistent Derivative of the function at the point.

Resolution

1) Using Paraconsistent Newton’s quotient placed in the form of Equation (15)

which can be written by:. Therefore, the function

on the Paraconsistent Logical Model shows the Paraconsistent Newton’s quotient as:

where: is the Paraconsistent Newton’s quotient.

K_{N} is the Newton Normalization Factor, calculated by Equation (13), such that:.

The Favorable Evidence Degree:

The Unfavorable Evidence Degree:

2) The first-order Paraconsistent Derivative of the function, and considering the increment of the variable x as, is calculated using the sequence:

a) Obtain the maximum value of the function at the point, where:

b) Paraconsistent Newton Normalization Factor, will be:

c) Applying Equation (15) of Paraconsistent Newton’s quotient obtained in item a to is:

The value of the first-order Paraconsistent Derivative in the physical world is obtained by the Equation (14):

Therefore, for these conditions, where the increment of the variable x is the final value of the derivative of the function in is:

.

6. Conclusion

This paper presented a method for Differential Calculus using the foundations of Paraconsistent Logic applied to the Newton’s quotient. The adequacy of the Differential Calculus to the Paraconsistent Logical Model made the contradictions existing in the Differential Calculus be accepted as inherent to a model based on real situations, so an imperfect world. Thus, the Paraconsistent Differential Calculus, structured in a logic that accepts contradictions, is able to dissolve the uncertainties, aggregating values that conventionally would be discarded. Following the procedures of Paraconsistent Mathematics were presented some examples where results are obtained from resolutions of first-order Paraconsistent Derivative of some functions. The results indicate that Paraconsistent Mathematics for resolutions using first-order derivatives responds well to these basic applications and facilitates the computational treatment. In the second part of this work it will be studied the methods for using the Paraconsistent Logical Model applied to solving problems through second-order derivative.

Conflicts of Interest

The authors declare no conflicts of interest.

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