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answered Are there any open mathematical puzzles?
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Feb
28
revised How can one differentiate with respect to variable upperbounds in summations?
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Feb
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asked How can one differentiate with respect to variable upperbounds in summations?
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Apr
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reviewed Approve Finding the 'n'th k-permutation of a set, and finding 'n' for a given k-permutation (lexicographical ordering)
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22
reviewed Approve Prove that a set is not countable
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reviewed Approve Is this a correct characterisation of natural equivalence?
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reviewed Approve Equivalence relation and equivalence class question
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reviewed Approve Heat Equation Steady state question
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answered On the meaning of the second derivative
Mar
6
comment How does one work backwards from an infinite series to a function?
This seems to reduce to simply finding the closed form of a series. That can't be answered in general because many different techniques exist for many different series.