Examples of Category Structures
نویسنده
چکیده
(1) For all sets X1, X2 and for all sets a1, a2 holds [:X1 7−→ a1, X2 7−→ a2 :] = [:X1, X2 :] 7−→ 〈a1, a2〉. Let I be a set. One can check that 0I is function yielding. Next we state two propositions: (2) For all functions f , g holds x(g · f ) = g ·x f . (3) For all functions f , g, h holds x( f · [:g, h :]) = x f · [:h, g :]. Let f be a function yielding function. Observe that x f is function yielding. Next we state the proposition
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