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

22 votes
Accepted

Is there a standard notation for off-diagonal transpose?

In http://arxiv.org/abs/math/0701936 (Fuchsian equations of type DN, by Vasily Golyshev and Jan Stienstra) the transpose of the matrix $A$ with respect to the anti-diagonal is denoted by $A^\tau$. It …
Zurab Silagadze's user avatar
2 votes
Accepted

Reference request for generalization of groups with out identity element?

I think such structures are called nonunital semigroups. See, for example, ftp://ftp.math.ethz.ch/EMIS/journals/MPRIA/2000/pa100i2/pdf/100210ai.pdf (Non-Unital Semigroup Crossed Products, by N.S. Lars …
Zurab Silagadze's user avatar
5 votes

Where does the name "R-matrix" come from?

According to http://link.springer.com/article/10.1007%2FBF01076717 the method of the classical r-matrix first appeared in the paper "On the complete integrability of the Landau-Lifshitz equation" by E …
Zurab Silagadze's user avatar