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Commit 2020-12-15 03:52 a959718e

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chore(algebra/quadratic_discriminant): golf proofs using limits (#5339)

Estimated changes

Modified src/algebra/ordered_ring.lean

deleted theorem exists_le_mul_self

deleted theorem exists_lt_mul_self

Modified src/algebra/quadratic_discriminant.lean

Modified src/order/filter/at_top_bot.lean

added theorem exists_le_mul_self

added theorem exists_lt_mul_self