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I have a problem about open or closed sets
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To prove that a set is open or closed, use basic theorems rather than direct arguments
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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
Mapped Quadrature
Transform equation to reach a solved pattern
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