Here's the source:http://web.mit.edu/dvp/www/Work/8.06/dvp-8.06-paper.pdf(adsbygoogle = window.adsbygoogle || []).push({});

Regarding page 5 of 14, I don't understand the multiple integrals thing. What is that supposed to mean? Ain't we supposed to sum up all the paths but why do they do the multiple integral thing?

Also regarding page 4 of 14 section 2.1 for the first few sentence, why does the difference in action differs ∆S≈πh where h here is the Dirac constant?

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# Path integral formula so hard

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