[brainscdf]

> or tell the reader your assumptions

It is right there in the first section of the article.

"In this discussion, we assume that we already know some basic properties of arithmetic operations such as the distributive property of multiplication over subtraction, existence of the additive inverse of real numbers, etc."

[kidintech]

Okay, I either didn't see it or that was added after my comment. Either way, that is exactly what I wanted.