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Question: is there a special name for matrices whose rows and columns sum to zero? I actually need information about those matrices and thus a keyword for online search. Edit: as there apparently is …

Question: Is there already a name for polylines in the euclidean plane, that have the property, that no interior of none the triangles, defined by one of the polyline's endpoints and a non-a …

if $a > b$ then the matrix is a special case of a Robinsonian matrix or R-Matrix; I encountered that name when searching for "matrix reordering" and remembered the question on MathOverflow vis.pku.e …

On the Wikepdia Page Graph Center I saw that the center of graph is the set of vertices with minimal eccentricity, i.e the set of vertices, whose maximal distance to other vertices is minimal. On the …

Is there an established name for graphs, that can be decomposed into a tree with at least three leaf nodes and a connected two-regular graph with the tree's leaf nodes as vertices? examples of …

Question: is there an established name for the set $\Big\lbrace\ f {\Large\ \boldsymbol{|}}\ f\in C^\infty\quad {\Large\boldsymbol{\land}}\quad \exists\,{k\in\mathbb{N}^+}:\frac{d^{i+k}}{dx^{i+k}}f(x) …

Is there agreement on how to interpret $r$ and $\varphi$ on a manifold if a reference point and a reference direction are given, or, put differently, does the definition of a reference point and, of a …

Question: is there a name for the following operation $$\sum_{i=1}^n\sum_{j=1}^mx_iy_j^T,\ x_i,y_j\in \mathbb{R}^k$$ i.e. for generating a square matrix that is the sum of the cartesian product of a …

I have implemented an algorithm that filters the edges of simple complete graph with weighted edges according to a criterion that is inspired by elementary planar geometry and, to my surprise, in the …

Let $\lbrace(x_0,y_0),(x_1,y_1),\,\dots,\,(x_n,y_n)\ |\ x_i\ne x_j\rbrace\subset\mathbb{R}^2$ Let $P$ and $Q$ be the polynomials that interpolate $\lbrace(x_0,y_0),(x_1,y_1),\,\dots,\,(x_{n-1},y_{n-1} …

is there an established name for the property that a square matrix can be made symmetric by permutation of its columns? Is it possible to recognize those kind of matrices efficiently?

I found two different definitions of the Moebius Ladder Graph, whose essential difference is, whether the smallest one shall be $K_4$ or $K_{3,3}$. according to Wikipedia (http://en.wikipedia.org/w …

The issues, that I could identify so far, which could be brought forward, to exclude either $K_4$ or even also $K_{3,3}$ are the following: $K_4$ should not count as a Moebius Ladder graph, because …

Let $f(x)$ be an elementary function defined on $X\subseteq\mathbb{R}$ and $\xi(x), \eta(y)$ strictly monotone for $x\in X,\, y\in f(x)$. Questions: is there an established name for functions of the …

Is there an established name for the matrices that establish the conditions for a linear combination of $n$ functions $\lbrace f_1(x),\dots,f_n(x)\rbrace$ being the $n$-times smoothly differentiable c …