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Commit 2021-09-30 08:02 d1f78e2e

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feat(order/filter/{basic, cofinite}, topology/subset_properties): filter lemmas, prereqs for #8611 (#9419)

Estimated changes

Modified src/order/filter/basic.lean

added theorem filter.tendsto.of_tendsto_comp

Modified src/order/filter/cofinite.lean

added theorem filter.tendsto.exists_within_forall_ge

added theorem filter.tendsto.exists_within_forall_le

added theorem function.injective.tendsto_cofinite

Modified src/topology/subset_properties.lean

added theorem filter.comap_cocompact