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

4 votes

Origin of the banana graph

I just had lunch with Oliver Schnetz and our conversation broached the topic whether any of us ever coined a name which stuck. He mentioned to be the first one to attach the word "banana" to the banan …
Friedrich Knop's user avatar
8 votes
Accepted

Clarification on the definition of a quotient singularity

The connection of toric varieties with quotient singularities is actually quite easy to describe. Let $\Delta\subseteq \mathbb R^n$ be a convex cone whose extremal rays are generated by $v_1,\ldots,v_ …
Friedrich Knop's user avatar
7 votes

Is there a name for this family of matrices?

I don't know a particular name for these matrices but they are special cases of matrices which have been considered in lattice theory. More precisely, let $(L,\wedge)$ be a finite semilattice and $\ph …
Friedrich Knop's user avatar
36 votes

Why are they called Spherical Varieties?

Since I am being asked the same question repeatedly and since the given answers are not quite correct, I post another answer despite the thread being so old. According to a talk by Domingo Luna aroun …
Friedrich Knop's user avatar