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partial derivatives
Hello,I have the following expressiongCan I have the expression equivalent to the above one, perhapsor of the form??If I can have those forms, in what condition?Thanks a lot.
partial derivatives
The square of an operator is the operator acting twice on the function and by symmetry of the second derivatives (if they exists) you arrive to your first expression.victor
partial derivatives
in addition to vplanas's form,you could also "diagonalize" it by changing coordinates to lose the cross term
partial derivatives
In fact, I wanted to use argument that( A + B )^2 >=0 In this case, can I use this kind of argument?Perhaps, I can not.