# Talk:Set function

From Encyclopedia of Mathematics

About the extended real line $[-\infty,+\infty]$: but what about $(-\infty)+(+\infty)$?

About hereditary σ-ring: also called σ-ideal.

About topological groups: I guess, only commutative groups appear in this context; really?

Boris Tsirelson (talk) 16:12, 19 September 2012 (CEST)

Choquet capacity could be mentioned as a notable example, too. --Boris Tsirelson (talk) 22:40, 1 October 2012 (CEST)

- I did think of adding capacities, and not only to this entry. On the other hand I feel we need something more systematic about the whole subject and hence I planned to postpone it. But if you want to add something, please go ahead. Camillo (talk) 23:47, 1 October 2012 (CEST)

**How to Cite This Entry:**

Set function.

*Encyclopedia of Mathematics.*URL: http://www.encyclopediaofmath.org/index.php?title=Set_function&oldid=28297