2022-09-10T00:00:00Z

Title: Good Math, by Mark C. Chu-Carroll, (page 20)

In chapter 3, Real Numbers, Part 2 Ordering, the 3rd axiom has an error. Note: I use “le” in place of “≤”, in case that latter symbol is not accepted on some parts of this website.

From the book:

3. If x le y. then for all z le 0, (x * z) le (y *z)

But example: if x = 3, y = 8, and z = -1,

then (3 * -1) le (8 * -1) = -3 le -8 is wrong!

## Two suggestions for correction of this:

## Please also add the book’s tag if it has not already present, thanks!

Hello @jimf,

The author isn’t here on DevTalk but I will pass along your erratum. Thank you for reading and for pointing out the error!

Best wishes,

Margaret