[Merged by Bors] - feat(algebra/linear_ordered_comm_group_with_zero) define linear_ordered_comm_group_with_zero #3072
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| @[simp] lemma zero_lt_unit (u : units α) : (0 : α) < u := | ||
| zero_lt_iff.2 $ unit_ne_zero u | ||
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| lemma mul_lt_mul'''' (hab : a < b) (hcd : c < d) : a * c < b * d := |
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Co-authored-by: Johan Commelin <johan@commelin.net>
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…ed_comm_group_with_zero (#3072)
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…ed_comm_group_with_zero (leanprover-community#3072)
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https://github.com/leanprover-community/lean-perfectoid-spaces/blob/43954f64ce4afdf4fa39e2aeef8ec43826b24f2a/src/valuation/linear_ordered_comm_group_with_zero.lean