From http://mathworld.wolfram.com i see that the integral notation was "the symbol was invented by Leibniz and chosen to be a stylized script "S" to stand for 'summation'. "(adsbygoogle = window.adsbygoogle || []).push({});

So from that i figure integrals are just summations. So what's the difference from Einstein Summation, where "repeated indices are implicitly summed over."

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# Different between integrals and Einstein summation?

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