Mueckenheim, W. (2011) Mathematik für die ersten Semester. 3rd Edition, Oldenbourg Verlag GmbH, Muenchen, 193.
http://www.amazon.de/Mathematik-f%C3%BCr-die-ersten-Semester/dp/348670821X/ref=sr_1_2?s=books&ie=UTF8&qid=1400566108&sr=1-2&keywords=Mathematik+f%C3%BCr+die+ersten+Semester

has been cited by the following article:

• TITLE: Sequences and Limits

  AUTHORS: Wolfgang Mueckenheim

  KEYWORDS: Series, Sequences, Limits, Definability of Real Numbers, Set Theory

  JOURNAL NAME: Advances in Pure Mathematics, Vol.5 No.2, January 26, 2015

  ABSTRACT: It is widely held that irrational numbers can be represented by infinite digit-sequences. We will show that this is not possible. A digit sequence is only an abbreviated notation for an infinite sequence of rational partial sums. As limits of sequences, irrational numbers are incommensurable with any grid of decimal fractions.