Commit 2022-01-24 21:01 511aa358

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feat(algebra/pointwise): add partial order to set_semiring (#11567) This PR introduces the natural inclusion order on sets on set_semiring. Zulip discussion

Estimated changes

Modified src/algebra/pointwise.lean

added theorem set.down_ssubset_down

added theorem set.down_subset_down

deleted def set.set_semiring

added theorem set.up_le_up

added theorem set.up_lt_up