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Context: I'm am doing a problem that wants me to prove you can interchange integrals and derivatives using the Lebesgue DCT. The conditions for the proof say "Assume $F(\cdot , t)$ is Lebesgue measurable", among other things.

What in the heck does that dot mean? It doesn't show it anywhere in the book.

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    It's a wildcard. The dot $\cdot$ is _any_ variable you like.2012-11-09

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This is the function $s\mapsto F(s,t)$.