Alessandro Malusà

myValue is declared as a byte, but it is later assigned an int value by the return of the analogRead function. The easiest fix is probably to change the type...

At the beginning of "Coordinates and the standard basis" there are two graphs whose axes, unlike most others across the book, only have the positive ends marked with arrows.

In Adafruit_SPITFT.h, line 182, "added to x" should read "added to y".