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Is there a standard notation for partial derivatives that uses indexes instead of letters to denote ideas such as the 3 rd partial derivative with respect to the the 2nd argument of a function?
As soon as a symbol gets superscripts and subscripts like [itex] \partial_{2,1}^{3,1} \ f [/itex] the spectre of tensors appears. Is a particular choice of what the super and subscripts mean consistent with the idea of tensors? Or are tensors irrelevant?
As soon as a symbol gets superscripts and subscripts like [itex] \partial_{2,1}^{3,1} \ f [/itex] the spectre of tensors appears. Is a particular choice of what the super and subscripts mean consistent with the idea of tensors? Or are tensors irrelevant?