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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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Geometric view of Hölder's inequality
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Use self-similarity to get a limit from an inferior or superior limit.
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