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How to work without an identity element when you clearly need it
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Decompose your ring using idempotents
How to use mathematical concepts and statements
How to work without an identity element when you clearly need it
If you don't have an identity element, a set of local units is more than enough
Ring theory front page
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Littlewood-Paley heuristic for derivative
Littlewood-Paley heuristic
Geometric view of Hölder's inequality
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Finding an interval for rational numbers with a high denominator
Try to prove a stronger result
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Prove a consequence first
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