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Questions
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Positive semidefinite decomposition, Laplacian eigenvalues, and the oriented incidence matrix

may 11 12 at 15:22 MathOverflow♦ 1●2●3

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407
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Spectral radius of a proper subgraph

jul 16 11 at 8:18 Seva 4,993●1●8●27

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What are some interesting grading/curving systems you have seen for a course? [closed]

dec 13 10 at 18:36 Aaron Meyerowitz 11.6k●1●10●31

 
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Complex root systems

dec 11 10 at 15:08 Jim Humphreys 26.1k●38●85

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Weighted Polytope

dec 10 10 at 12:58 sleepless in beantown 2,071●5●13

 
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Generalized Courant-Fischer theorem

dec 10 10 at 4:53 hypercube 278●1●8