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Whenever you see a minus sign, look for the definite integral.

The integral from a to b of f(x) dx = F(b) - F(a) where f(x) is the derivative with respect to x of F(x) is the only place I know of in mathematics where the unflappable minus sign can appear out of a seemingly innocuous operation.

Homework problem: What definite integral was performed to obtain the lagrangian L = T - V?

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2020

September

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August

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July

It's always better to understand something somebody wrote than to write something nobody understands.

June

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May

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April

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March

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February

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January

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2019

November

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July

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May

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Don't be too concerned if your integral diverges.

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April

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February

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January

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2018

December

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January

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2017

December

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2016

December

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March

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2015

October

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June

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