We also replace some hyphens with en-dashes where appropriate.
Note that both changes, use of the correct multiplication symbol as well as the en-dash should be changed throughout the book for consistency. This can be done if we decide to use these consistently.
It's good typographic practice to use the correct math symbols for multiplication (see the links below).
https://practicaltypography.com/math-symbols.html
and
http://www.malinc.se/math/latex/basiccodeen.php
We also replace some hyphens with en-dashes where appropriate.
Note that both changes, use of the correct multiplication symbol as well as the en-dash should be changed throughout the book for consistency. This can be done if we decide to use these consistently.