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For questions about mathematical notation, i.e. the symbols used to represent mathematical objects and operations.

10 votes
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notation for finite sequence with one element is removed

Despite the fact that "the indices are out of order," it is very convenient notation for game theory once you get used to it. … Other solution concepts can also be defined compactly with this notation. …
Noah Stein's user avatar
  • 8,501
1 vote

Conventional notation for the probabilistic functor

I use $\Delta$ both because it makes me think of the "d" at the beginning of "distribution" and because when $X$ is a discrete set of cardinality $\lvert X \rvert = 3$ then $\Delta(X)$ actually is a t …
Noah Stein's user avatar
  • 8,501