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Don't suggest non-existent eq_symm - #405

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jhrcek wants to merge 3 commits into
avigad:masterfrom
jhrcek:jan/no-eq_symm
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jhrcek wants to merge 3 commits into
avigad:masterfrom
jhrcek:jan/no-eq_symm

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@jhrcek

@jhrcek jhrcek commented Jul 1, 2026

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This suggestion is misleading as the suggested "eq_symm" doesn't exist in recent mathlib versions, unlike symm.

Comment thread MIL/C02_Basics/S02_Proving_Identities_in_Algebraic_Structures.lean Outdated
@grunweg

grunweg commented Aug 3, 2026

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@PatrickMassot With the suggested edit, this LGTM.

Co-authored-by: Michael Rothgang <rothgang@math.uni-bonn.de>
Finish the proof using the theorems
``abs_mul``, ``mul_le_mul``, ``abs_nonneg``,
``mul_lt_mul_of_pos_right ``, and ``one_mul``.
``mul_lt_mul_of_pos_right``, and ``one_mul``.

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The extra space makes an undesirable backtick appear in the book.

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