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"Quiver" is the word used for "directed graph" in some parts of representation theory. The main reason to use the term quiver is to indicate an interest in considering representations of the quiver.

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Reference request: tangent space to moduli space of coherent sheaves is $\operatorname{Ext}^...

Is there a standard reference for the fact that, in an appropriate algebraic-geometrical context, the tangent space at the point $[E]$ to the moduli space $\mathcal M$ is something like $\operatorname …
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Reference request: tangent space to moduli space of coherent sheaves is $\operatorname{Ext}^...

Theorem 2.6 (page 9) from Hartshorne Lectures on Deformation Theory (it seems that Hartshorne uses the same notation both for an affine scheme $D$ and its function algebra): Let $X$ be a scheme over …
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