When the number zero starts exhibiting its mean or ugly side, by being a “numerical troublemaker” to other numbers in an arithmetic operation.
Zero can really be a “numerical asshole” if it’s allowed to behave in a zeroist manner vis-à-vis fellow numerals, when they’re part of a mathematical operation like 1 ÷ 0, 0 ÷ 0, or 0⁰.
by MathPlus November 30, 2018