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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
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Geometric view of Hölder's inequality
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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Plenty of LaTeX errors
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Countable but impredicative
I don't think this statement
30 weeks 2 days
choice of the field
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1 year 17 weeks
Higher dimensional analogues
1 year 37 weeks