[Math] What are some practical applications of measure theory apart from providing theoretically rigourous foundations

measure-theory

It seems that measure theory has a very good theoretical purpose, in that it provides a rigorous framework to define a lot of what we do in analysis. However, I have a hard time thinking of a situation where you need to invoke a purely measure-theoretic concept that is not serving as a "shoring up" lemma/theorem to the "main idea", which will often be some integral or limit.

Are there instances where the measure theoretic idea is the crux of a result that isn't related to probability theory? At the broader level, where are non-probabilistic measureable spaces even used?

Best Answer

@WillJagy pointed me to Geometric Measure Theory, which requires measures to understand areas/lengths of things like fractals.

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