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Jun 15, 2020 at 7:27 history edited CommunityBot
Commonmark migration
Nov 5, 2013 at 21:49 comment added Giovanni Anyway, if this is a counterexample or not depends on the definition of integrable: a function can be defined to be integrable in the extended sense if either $\int f^+ < \infty$ or $\int f^- < \infty$. In that case, the characteristic function of the diagonal is an honest integrable function (in the extended sense) and hence a counterexample to the statement, +1 indeed
Apr 21, 2012 at 13:59 comment added Adam Saltz Ah! Thank you for pointing out my error, Makoto (and Pietro and Juan).
Apr 19, 2012 at 5:06 comment added Makoto Kato Adam, the measure of the diagonal is not finite. So that's not a counterexample for my assertion.
Apr 19, 2012 at 4:37 history answered Adam Saltz CC BY-SA 3.0