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A
Algebra front page
Algebraic geometry front page
D
Decompose your ring using idempotents
H
How to use tensor products and evaluation maps in representation theory
I
If you don't have an identity element, a set of local units is more than enough
T
Transform equation to reach a solved pattern
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Geometric view of Hölder's inequality
Diagonal arguments
Finding an interval for rational numbers with a high denominator
Try to prove a stronger result
Use self-similarity to get a limit from an inferior or superior limit.
Prove a consequence first
Lower degree by increasing dimension (or vice-versa)
Numerical optimization
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covering a disc
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