Naturals pairing function #
This file defines a pairing function for the naturals as follows:
0 1 4 9 16
2 3 5 10 17
6 7 8 11 18
12 13 14 15 19
20 21 22 23 24
It has the advantage of being monotone in both directions and sending ⟦0, n^2 - 1⟧
to
⟦0, n - 1⟧²
.