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## Main Question or Discussion Point

Hi!

I have some trobles while studying the lagrange mechanics chapter of Marion's Classical Mechanics.

There are some variation techniques in that book, but I only studied calculus and elementary linear algebra in my freshman year. I can't understand how partial derivation and delta notation works. Therefore I want to study more about the variation techniques.

Can you recommend me a book about calculus of variation for physics?

Sorry for my poor english :x

I have some trobles while studying the lagrange mechanics chapter of Marion's Classical Mechanics.

There are some variation techniques in that book, but I only studied calculus and elementary linear algebra in my freshman year. I can't understand how partial derivation and delta notation works. Therefore I want to study more about the variation techniques.

Can you recommend me a book about calculus of variation for physics?

Sorry for my poor english :x