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 0 Differential coefficient

 0 Proof-theoretic semantics

 0 Rules of passage (logic)

 0 S2S (mathematics)

 0 Semantic theory of truth

 0 Turnstile (symbol)

 0 Vacuous truth

 0 AsciiMath

 0 Bloch's principle

 0 Clubsuit

 0 Courant minimax principle

 0 Hopf lemma

 0 Hume's principle

 0 Circulation problem

 0 Firing squad synchronization problem

 0 Lattice problem

 0 Yamabe problem

 0 Greater-than sign

 0 Radical symbol

 0 Symbols for zero