feat(group_theory/congruence): create file about congruence relations #1690
add congruence.lean
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add has_mul
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Merge branch 'master' of https://github.com/leanprover-community/math…
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add definition of congruence relation
fc154172
Merge branch 'master' of https://github.com/leanprover-community/math…
f59e9147
Merge branch 'congruence' of https://github.com/leanprover-community/…
cf4070a2
minor changes
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responding to review comments
eb7454e0
fix docstring mistake in setoid.lean
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Merge branch 'master' into congruence
8a7261ae
mergify
merged
428aec90
into master 6 years ago
mergify
deleted the congruence branch 6 years ago
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