VarD

VarD will be the head of the future variational derivative in xTensor`.

• The planned notation wil be VarD[field][expr], where expr is the expression being differentiated and field is the expression with respect we differentiate. Perhaps VarD[expr, field] is enough because there is no syntactic rule against this simpler version.
• See: Section 4.8.
• New in version ?.
• Last update: 28-X-2007 for version 0.9.3 of xTensor`.


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