Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2017-11-20 01:30 40d2b505

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fix(algebra/order): update to lean The new not_lt_of_lt in core is not substitutable for this one because it is in the new algebraic hierarchy and mathlib is still on the old one. But this isn't used anywhere, so I'll just remove it instead of renaming.

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