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单词 unary operation
释义
unary operation

Mathematics
  • A unary operation on a set S is a rule that associates with any element of S a resulting element of S. The following are examples of unary operations: the rule associating with any subset A of a set E its complement A′; the rule associating with a group element g its inverse g–1.


Computer
  • defined on a set S. A function from the domain S into S itself. The identity function is unary. Other examples are the operations of negation in arithmetic or logic and of taking complements in set theory or in Boolean algebra. Although basically functions, unary operations are frequently represented using a special notation, e.g. ¬A or A′. When the set S is finite, a truth table can be used to define the meaning of the operation.


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