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不等式

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同伦论

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同调论

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Presheaf
Let $X$ be a topological space.A presheaf $A$ (of sets) on $X$ is a contravariant functor from the category of open subsets of $X$ and inclusions to t ...
泛函

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Sheaf
Let $X$ be a topological space.A sheaf $\mathcal{F}$ of sets on $X$ is a presheaf of sets which satisfies the following additional property: Given any ...
Locally ringed spaces
A locally ringed spaces is a ringed space $(X, \mathcal{O}_ X)$ such that the stalks of $\mathcal{O}_ X$ are local rings. ...
Ringed spaces
A ringed space is a pair $(X, \mathcal{O}_ X)$ consisting of a topological space $X$ and a sheaf of rings $\mathcal{O}_ X$ on $X$. A morphism of ringe ...
Topological space
A topological space is the most general type of a mathematical space that allows for the definition of limits, continuity, and connectedness. Common t ...
Groupoid
A groupoid is a category where every morphism is an isomorphism. ...
Magma
A magma (or binary algebraic structure, or, alternatively, a mono-binary algebra) $(S, \cdot)$ is a set equipped with a binary operation on it. ...
Differential geometry

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