Basic Functions and Operations on Functions
نویسنده
چکیده
We define the following mappings: the characteristic function of a subset of a set, the inclusion function (injection or embedding), the projections from a Cartesian product onto its arguments and diagonal function (inclusion of a set into its Cartesian square). Some operations on functions are also defined: the products of two functions (the complex function and the more general product-function), the function induced on power sets by the image and inverse-image. Some simple propositions related to the introduced notions are proved.
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A characterization of triple semigroup of ternary functions and Demorgan triple semigroup of ternary functions
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