## All Questions

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### Domains of homolorphy in the complex plane

There is a proof of Mittag-Leffler's theorem with an explicit construction of a holomorphic function with the prescribed poles with prescribed order and residues, for a countable d …
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### Is a proper quotient map closed ?

I am trying to produce closed quotient maps, as they allow a good way of creating saturated open sets (as in this question). A map $f:X\rightarrow Y$is called proper, iff preimage …
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### Associativity with infinite nesting

I was trying to understand the Eilenberg-Mazur swindle (which I learned about here) especially as it could be used to show that if $A, B$ are compact (topological) $n$-manifolds wh …
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### Image of composite morphisms

I am new to categories and I found in a book that it is possible to construct a category in which the following are true: there exist morphisms $f:A \to B$ and $g:B \to C$, and mon …
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### Finite Idempotent Semirings (Dioids)

How many finite idempotent semirings (dioids) are there of order n? And how many have an addition operation that coincides with a maximum operation for some ordering of the elemen …
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### How much has been written down about Deligne’s geometric approach to the order formula for a finite group of Lie type?

This is a follow-up to a recent mathoverflow question 34387 about computing the orders of finite unitary groups and the comments made there. Between 1955 (Chevalley's Tohoku pape …
In the general case, quiver cycles are of the form of orbit closures of $GL\cdot V_{\vec{r}}$, where $GL= \prod_{i=0}^n GL_{r_i}$ is the possible changes of basis on all of the vec …