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Theorem continuous_on.preimage_open_of_open

Modification history

2019-10-08 13:51
src/topology/continuous_on.lean
refactor(topology/continuous_on): move continuous_{on,within_at} to own file (#1516) …
Modified continuous_on.preimage_open_of_openView on Github →
2019-05-14 10:24
src/topology/order.lean
feat(analysis/normed_space/deriv): more material on derivatives (#966) …
Added continuous_on.preimage_open_of_openView on Github →