[Merged by Bors] - feat: Lemmas about (extChartAt I x).target being open if we're boundaryless
#10840
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…daryless `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
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…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
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(extChartAt I x).target being open if we're boundaryless(extChartAt I x).target being open if we're boundaryless
thorimur
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Feb 24, 2024
…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
thorimur
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Feb 26, 2024
…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
riccardobrasca
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Mar 1, 2024
…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
dagurtomas
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Mar 22, 2024
…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
Louddy
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Apr 15, 2024
…daryless (#10840) `(extChartAt I x).source` is always open, so there are nice lemmas like 1. `isOpen_extChartAt_source` 2. `extChartAt_source_mem_nhds` 3. `extChartAt_source_mem_nhds'` `(extChartAt I x).target` fails to be open near manifold boundary points, but we recover the nice lemmas when `I.Boundaryless`.
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(extChartAt I x).sourceis always open, so there are nice lemmas likeisOpen_extChartAt_sourceextChartAt_source_mem_nhdsextChartAt_source_mem_nhds'(extChartAt I x).targetfails to be open near manifold boundary points, but we recover the nice lemmas whenI.Boundaryless.