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How to work without an identity element when you clearly need it
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If you don't have an identity element, a set of local units is more than enough
Decompose your ring using idempotents
How to work without an identity element when you clearly need it
Ring theory front page
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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)
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covering a disc
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