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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
Numerical solution of partial differential equations
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Higher dimensional analogues
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Angela, I think you missed
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covering a disc
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Only if squares are of the
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Squares?
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