Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-06-13 06:04 e13fd486

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docs(data/nat/pairing): add module docstring (#7897)

Estimated changes

deleted theorem nat.le_mkpair_left
deleted theorem nat.le_mkpair_right
added theorem nat.left_le_mkpair
added theorem nat.right_le_mkpair
deleted theorem nat.unpair_le_left
deleted theorem nat.unpair_le_right
added theorem nat.unpair_left_le
added theorem nat.unpair_right_le