[Oberon] real math

[Treutwein Bernhard]

>
>"Floating-point numbers are only an approximation to the real numbers of
>mathematics. As a consequence, computations involving floating-point values
>are inexact because each operation may be subject to truncation. The
>resulting problems have been investigated in detail, and are treated in
>every text on numerical mathematics."
>

more to floating point arithmetic can be found in Vol. 2, Chapter 4.2 of 
Donald Knuth's "The Art of Computer Programming".

--
  Bernhard