What is this?
$$\LARGE q \not\equiv 0 \pmod M$$
It looks like it would be the opposite of equivalence but then if that’s the case, I don’t know how to read the expression…
2026-04-03 02:00:40.1775181640
What is the symbol before the $\pmod M$?
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$q \not \equiv 0 \pmod{M}$ means $q$ is not congruent to $0$ modulo $M$.