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8m
comment Polynomial: Number of solutions
Which are you interested in, finding the number of solutions or finding solutions? These are very different questions.
54m
comment Impossible Math Riddle
This relies on the (rather ridiculous) assumption that if two people have the same age (as an integer), there wouldn't be an "eldest".
3h
comment Obfuscated proofs
What you might look for is a difficult proof of some rather general statement, which is then applied to a particular case that would have been easier to tackle on its own. For example, existence of a solution of $ax = b$ for $a \ne 0$ as a corollary of the Fundamental Theorem of Algebra.
3h
answered $f(x)=\sum_{n=0}^{\infty}a_n x^n$ and there exists a sequence $(x_n)$ tending to $0$ such that $f(x_n)=0$ for all $n$, then $f(x)=0$ for all $x$.
3h
comment Why covariance constraint subsumes the average power constraint?
Some more context and definitions might be helpful. In particular, what is $W$? How does $p(x)$ relate to $K_X$? How does $S$ relate to $P$? What is "the paper"?
16h
awarded  Nice Answer
17h
answered Spectral theory for $f\mapsto f\circ g$
1d
comment What term do I use to distingush between a data visualisation graph and a nodes and edges graph?
For googlers, it's very annoying that graph theorists decided to use everyday English words for so many of their terms, rather than more easily searchable ones such as "syzygy".
1d
comment Can two perfect squares average to a third perfect square?
$a < b < c$ if $0 < y < x$.
1d
comment The direct use of Cauchy's integral is illegal
Mathematics is almost never illegal. Exception: deriving while impaired.
1d
revised Can two perfect squares average to a third perfect square?
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1d
answered Can two perfect squares average to a third perfect square?
1d
revised Efficient algorithm to find the maximum of a sum of $m$ sines
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1d
revised Exponential bound on norm of matrix exponential (of linear ODE)
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1d
answered Method for proving polynomial inequalities
1d
answered Does this kind of integral rearrangement work?
1d
revised Efficient algorithm to find the maximum of a sum of $m$ sines
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1d
revised Efficient algorithm to find the maximum of a sum of $m$ sines
added 94 characters in body
1d
answered Efficient algorithm to find the maximum of a sum of $m$ sines
1d
answered Calculate sum $S=\sum_{k=0}^{n}\begin{pmatrix} k \\ m\end{pmatrix}$