Wikimedia Commons has media related to Mathematical proof.

This category includes articles on basic topics related to mathematical proofs, including terminology and proof techniques.

Related categories:

• Pages which contain only proofs (of claims made in other articles) should be placed in the subcategory Category:Article proofs.
• Pages which contain theorems and their proofs should be placed in the subcategory Category:Articles containing proofs.
• Articles related to automatic theorem proving should be placed in Category:Automated theorem proving.
• Articles on proof theory should be placed in Category:Proof theory.