Andrew Yang

feat(order/height): The height of a poset

13

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feat(topology/sheaves/*): Notation for restriction of sections.

12

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feat: Generalize corollaries of rank-nullity theorem.

2

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Also used the new simp lemmas to golf `AlgebraicGeometry/ProjectiveSpectrum/*` --- [](https://gitpod.io/from-referrer/)

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### Prerequisites Please put an X between the brackets as you perform the following steps: * [x] Check that your issue is not already filed: https://github.com/leanprover/lean4/issues * [x] Reduce the...

feat(RingTheory): Surjective on stalks ring homomorphisms.

1

--- [](https://gitpod.io/from-referrer/)

feat(AlgebraicGeometry/Limits): Coproducts of Schemes

4

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