Proof
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Mathematical proof
A mathematical proof is a step-by-step definition of the truth or falsity of a mathematical theorem. Proofs build on axioms, which are statements that are assumed to be true without proof, as well as previously-proved theorems.
Several types of proofs are widely used, such as proof by contradiction and proof by induction. Proofs that rely only on certain simple forms of reasoning are sometimes called elementary proofs.
Andrew Schlafly cited the lack of a Wikipedia page on "elementary proof" as proof of bias in Wikipedia. Ironically, at that time Conservapedia did not even have a page on "proof".