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  • 0 posts edited
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  • 15 votes cast
Aug
4
accepted For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
Aug
4
comment For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
Thanks Ted, I forgot positive roots had all coefficients positive, not just positive height.
Aug
4
revised For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
edited tags
Aug
4
revised For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
deleted 2 characters in body; edited tags
Aug
4
asked For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
Jul
29
awarded  Popular Question
Mar
21
awarded  Yearling
Mar
21
awarded  Nice Question
Feb
15
asked Restricting codomain of dominant map $\varphi\colon X\to Y$ of varieties to get a finite map?
Feb
15
accepted The local rings of $xy=0$ and $xy+x^3+y^3=0$ are not isomorphic, but have isomorphic completions?
Dec
11
awarded  Autobiographer
Dec
11
asked The local rings of $xy=0$ and $xy+x^3+y^3=0$ are not isomorphic, but have isomorphic completions?
Dec
11
accepted Conditions to ensure the chain homotopy category $K(\mathcal{A})$ is abelian?
Jul
2
awarded  Curious
Apr
22
comment Conditions to ensure the chain homotopy category $K(\mathcal{A})$ is abelian?
@ZhenLin I guess I'm mostly curious if there are cases where it is in fact abelian.
Apr
22
asked Conditions to ensure the chain homotopy category $K(\mathcal{A})$ is abelian?
Nov
17
comment If $T$ has an adjoint, why is $T(X\times Y)\simeq T(X)\times T(Y)$?
Thanks Stefan. What is $\eta_B$?
Nov
17
asked If $T$ has an adjoint, why is $T(X\times Y)\simeq T(X)\times T(Y)$?
Nov
17
accepted What is meant by a natural morphism $T(X\times Y)\to T(X)\times T(Y)$?
Nov
17
comment What is meant by a natural morphism $T(X\times Y)\to T(X)\times T(Y)$?
Thank you Smoore.