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The simplest, most elegant and strongest version I know is, by far, the one in Aderson's book (see page 106 and ss.) He deals directly with the variational equation, with no explicit mention to the lagrangian. (By the way, it is surprising why this statement is not mentioned in Schwarzbachs' book!) |
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The simplest, most elegant and strongest version I know is, by far, the one in Aderson's book (see page 106 and ss.) He deals directly with the variational equation, with no explicit mention to the lagrangian. (By the way, it is surprising why this statement is not mentioned in Schwarzbachs' book!) |
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