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 May 18 asked A name for the property $\| x \star y \| = \| x \| \| y \|$. May 18 asked Curious formula for minimum? May 14 answered Is there a good book on Circulant Matrices? May 13 asked Is there a good book on Circulant Matrices? May 11 asked Notation for a vector with constant equal components of arbitrary dimension May 10 asked Notation for replacing a matrix column with a vector Apr 13 answered Calculate $\int_\Gamma ze^{z}dz$ where $\Gamma$ is line from point $z_1=0$ to point $z_2=\frac{\pi i}{2}$ Apr 4 asked Solving $z=w/2-\sin(tw)/(2t)$ for $w$ Mar 30 asked Question on branches and $\iff$. Mar 30 answered $(\delta,\varepsilon)$ Proof of Limit Mar 26 asked What does $O\left(\frac{1}{\log\log T}\right)$ mean? Mar 17 asked On norms for “more complicated objects” Mar 11 asked Is there a name for an object with both position and velocity? Feb 23 answered Riemann Zeta Function and Including Complex Numbers Feb 19 asked What is known about the complex solutions to $\zeta(s)=-1$? Jan 24 answered The meaning of dot centered vertically, as in $3\cdot 5$ Jan 20 answered Closed form for $\prod_{k=1}^n (a+k^2)$ Jan 18 asked Is there a name for functions “opposite in nature” to orthogonal functions? Jan 17 asked Examples of orthogonal/orthonormal functions which are not finite degree polynomials? Jan 7 answered How to calculate $\int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx$?