You also can help me to make my book better

No book is perfect, and I expect that watchful readers will be able to spot a few mistakes before the end of this one. Thanks to Fred Szabo, Bernard Liengme, Jakub Majewski and Susan Bagby some of the major grammar, typographic and technical errors were avoided in this text. However, I guess some minor bugs are still there. Therefore, I would be grateful to my readers for sending me information about bugs in my book and some possible improvements.

Errors in the first edition Getting Started with MuPAD

Page 259, line 5 from the top:
there is: squares:=squares.[drawIn(x,y,size)]
There should be: squares:=squares.[drawIn(x,y,size/2)]