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 0 Proof of impossibility

 0 Quantum logic

 0 Rosser's trick

 0 Schröder–Bernstein property

 0 Simplification of disjunctive antecedents

 0 Solèr's theorem

 0 Superposition calculus

 0 Truth-value semantics

 0 Truth function

 0 Witness (mathematics)

 0 Harnack's principle

 0 Homotopy principle

 0 Hopf maximum principle

 0 Maximum modulus principle

 0 Minimum-cost flow problem

 0 Prescribed Ricci curvature problem

 0 Nabla symbol

 0 Ordered set operators

 0 Tilde

 0 Tombstone (typography)