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

6 votes

Funny names of mathematical objects?

"Normal family". "Shared values" (a popular research area in the theory of meromorphic functions. Many theorems in this area say that "a family (of functions) is normal if its members share enough v …
Alexandre Eremenko's user avatar
10 votes

What is an "exact solution" to a PDE?

There is no formal definition. This depends on context. Those who say that "exact solution" means a "closed form solution" have to explain what a "closed form" is. A series whose coefficients are rati …
Alexandre Eremenko's user avatar
30 votes

The origin(s) of the word "elliptic"

The origin of all these uses is very different. Joe Silverman explained the genesis of the sequence ellipse $\rightarrow$ elliptic integral $\rightarrow$ elliptic function $\rightarrow$ elliptic curve …
Martin Sleziak's user avatar
6 votes
Accepted

Terminology: "sufficiently large absolute constant"

"Absolute constant" means that it does not depend on anything. For example, $3, 10^{12},\pi$ and Feigenbaum number are absolute constants. They are real numbers. "Sufficiently large" means that the a …
Alexandre Eremenko's user avatar
1 vote

A function in $\mathbb{R}^n$ is equal to its linearization in each point

Such functions are linear. In dimension $1$, your equation means $$P(x)=P'(x)x$$ Solving this differential equation we obtain $P(x)=cx$. Now in arbitrary dimension, your condition can be written as $$ …
Alexandre Eremenko's user avatar
1 vote
Accepted

proper use of the word "stereographic"

My standard reference for elementary geometry is the book M. Berger, Geometry. In section 18.1.4 he defines ``stereographic projection'' in any dimension. Of course it was originally introduced for 2 …
Alexandre Eremenko's user avatar
6 votes
Accepted

Terminology question in dynamical systems

The commonly accepted term is "completely invariant". A set which is mapped to itself is called simply "invariant" and a stronger property to coincide with its preimage is called complete invariance. …
Alexandre Eremenko's user avatar