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Apr
30
comment If $au + bv + cw = 0$ with $a+b + c = 0$ then $u,v,w$ are collinear
Ok, however $a+b=0$ with $a\neq 0$ and $b\neq 0$, and $c=0$ won't help much: in that case, $u,v$ are collinear, and you know nothing about $w$. However, you know for sure $u,v,w$ are coplanar.
Apr
29
reviewed No Action Needed Is there a simpler function with this shape?
Apr
29
reviewed Looks OK Is there any integral for the Golden Ratio?
Apr
29
reviewed Reopen Lebesgue measure-preserving differentiable function
Apr
24
reviewed Looks OK Is there convergence in this sequence?
Apr
24
reviewed No Action Needed Probability of a set of random integers containing number in specific range
Apr
22
reviewed Looks OK How to calculate this integral using dominated convergence theorem?
Apr
22
reviewed Close Integrating division
Apr
22
reviewed Leave Open What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
Apr
22
reviewed Leave Open If $K\cap\Bbb Q^{\text{cycl}}=\Bbb Q(\zeta_m)$ and $K/\Bbb Q$ Galois, then $\text{Gal}(K(\zeta_n)/K)\cong\text{Gal}(\Bbb Q(\zeta_n)/\Bbb Q(\zeta_m))$
Apr
22
reviewed Close Color the edges of $K_6$ red or blue. Prove that there is a cycle of length 4 with monochromatic edges.
Apr
22
reviewed Reopen Diffeomorphism group of product manifold
Apr
22
comment Complexity of Gaussian Process algorithms is $\mathcal{O}(n^3)$
EHHH, Gaussian elimination is an $O(n^3)$ algorithm, however it does not make use of matrix product. To solve a linear system $Au=v$, you may first inverse the matrix (also with Gaussian elimination, but in a slightly different way as you solve $n$ systems instead of a single one, still in $O(n^3)$) and compute afterwards $u=A^{-1}v$, but then this last matrix-vector product is $O(n^2)$.
Apr
22
comment Write $π = (3, 2, 5)(2, 5, 4)$ in “table” notation?
Chris, you really have to tell which convention you assume for the product of permutations, as both are used (left-to-right and right-to-left). JMoravitz and probablyme answers are both correct.
Apr
21
reviewed Reopen Generalisation of the sum operator for the divergent geometric series
Apr
20
reviewed Looks OK Distance between points in a square
Apr
20
reviewed Approve Implementation of Jacobi theta functions in Matlab
Apr
20
reviewed Approve Exponentiation on the natural numbers. Prove the identities $n^{(m+k)}=n^m \cdot n^k$ and $n^{(m \cdot k)}=(n^m)^k$.
Apr
20
reviewed No Action Needed (partial) Derivative of norm of vector with respect to norm of vector