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Questions of the kind "What's the name for a X that satisfies property Y?"

11 votes
2 answers
2k views

Great polyhedra: What does "great" signify?

Great Cubicuboctahedron Great Icosacronic Hexecontahedron Great Rhombic Triacontahedron Great Snub Icosidodecahedron Great Stellated Dodecahedron Great Triakis Octahedron ... There are many polyhedr …
Joseph O'Rourke's user avatar
3 votes
1 answer
595 views

Node-edge coloring of graphs

There must be work on this concept, but I am not finding it through searches, perhaps using the wrong terminology.           …
Joseph O'Rourke's user avatar
25 votes
3 answers
12k views

Why is a ring called a "ring"?

Why is a ring called "ring" (or Zahlring in German)? There seems to (naive) me nothing more ring-like to a ring than there is to a group or a field. I am particularly interested to learn why the wor …
Joseph O'Rourke's user avatar
6 votes
1 answer
1k views

Löwner-John Ellipsoid: incribed and circumscribed

I have two questions about the Löwner-John ellipsoid, one just terminology, the other more substantive. Let $K$ be a convex body in $\mathbb{R}^d$. Q1. …
Joseph O'Rourke's user avatar
67 votes
16 answers
9k views

What do named "tricks" share?

There are a number of theorems or lemmas or mathematical ideas that come to be known as eponymous tricks, a term which in this context is in no sense derogatory. Here is a list of 11 such tricks (the …