,
Table 4. Number of correspondences from the set X (with the number of elements x) to the set A (with the number of elements
a). Ck means a set C with the number of elements k. The subscripts mean that one counts the correspondences possessing the properties whose notations enter into these subscripts:p —correspondences defined everywhere;
f — functional correspondences;
i — injective correspondences;
s — surjective correspondences
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