choice function
mathematical function f that is defined on some collection X of nonempty sets and assigns some element of each set S in that collection to S by f(S)
en-US/ˈt͡ʃɔɪs ˈfʌŋkʃən/
en-GB/ˈt͡ʃɔɪs ˈfʌŋkʃn/
mathematical function f that is defined on some collection X of nonempty sets and assigns some element of each set S in that collection to S by f(S)