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'''Ampheck''', from [[Ancient Greek|Greek]] αμφήκης double-edged, is a term coined by [[Charles Sanders Peirce]] for either one of the pair of logically dual operators, variously referred to as [[Peirce arrow]]s, [[Sheffer stroke]]s, or [[logical NAND|NAND]] and [[logical NNOR|NNOR]].  Either of these logical operators is a ''[[sole sufficient operator]]'' for deriving or generating all of the other operators in the subject matter variously described as [[boolean function]]s, [[monadic predicate calculus]], [[propositional logic]], sentential calculus, or [[zeroth order logic]].

'''Ampheck''', from [[Ancient Greek|Greek]] αμφήκης double-edged, is a term coined by [[Charles Sanders Peirce]] for either one of the pair of logically dual operators, variously referred to as [[Peirce arrow]]s, [[Sheffer stroke]]s, or [[logical NAND|NAND]] and [[logical NNOR|NNOR]].  Either of these logical operators is a ''[[sole sufficient operator]]'' for deriving or generating all of the other operators in the subject matter variously described as [[boolean function]]s, [[monadic predicate calculus]], [[propositional logic]], sentential calculus, or [[zeroth order logic]].