improved basics of classes

Author: thomasWeise

README.md

@@ -64,6 +64,7 @@ Die Slides zum Kurs in deutscher Sprache können unter <https://thomasweise.gith
 39. [Generator-Funktionen](https://thomasweise.github.io/programmingWithPythonSlidesDE/39_generator_funktionen.pdf)
 40. [Operationen für Iteratoren](https://thomasweise.github.io/programmingWithPythonSlidesDE/40_operationen_für_iteratoren.pdf)
 41. [Klassen: Grundlagen](https://thomasweise.github.io/programmingWithPythonSlidesDE/41_klassen_grundlagen.pdf)
+42. [Klassen: Kapselung](https://thomasweise.github.io/programmingWithPythonSlidesDE/42_klassen_kapselung.pdf)
 
 
 ### 2.3. The Slides in English

bookbase

@@ -9,7 +9,7 @@
 \begin{sloppypar}%
 In an ideal world, we would have a similar feature also for real numbers.
 However, such a thing cannot be practically implemented.
-You will certainly remember the numbers $\numberPi\approx3.141\decSep592\decSep653\decSep590\dots$ and $\numberE\approx2.718\decSep281\decSep828\decSep459\dots$ from highschool maths.
+You will certainly remember the numbers $\numberPi\approx3.141\decSep592\decSep653\decSep590\dots$ and $\numberE\approx2.718\decSep281\decSep828\decSep459\dots$ from high school maths.
 They are transcendental~\cite{N1939TTOP,APM1991AAAFI:TOEAP,F2011TTOEAP}, i.e., their fractional digits never end and nobody has yet detected an orderly pattern in them.
 Since these numbers are \inQuotes{infinitely long,} we would require infinitely much memory to store them \emph{if} we wanted to represent them \emph{exactly}.
 So we don't and neither does \python.