Variation of action and the connection of mathematics and physics

Sometimes it looks mysterious, what is it the variational derivative and what is it the physical term variation. I try to give a simple explanation, how is the connection with the weak derivative.

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johnynew

I was studying theoretical physics at the Charles university in Prague. I am interested in quantum gravity and cosmology. Other my activity is playing the piano. I regularly give concerts. My favourite authors are S. Rachmaninoff, A. Scriabin and J. S. Bach. You could find more informations at www.classicalprague.cz or hraniprohrani.cz.

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