help1please
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Homework Statement
Homework Equations
The Attempt at a Solution
Suppose you see something like\frac{\partial^2 \phi}{\partial X^{\mu}\partial X^{\nu}}
What I am interested here is the denominator. Is the term \partial X^{\mu}\partial X^{\nu} simply X taken to the second derivative? I know one can write it like
\partial X^{\mu} (\frac{\partial \phi}{\partial X^{\nu}})
But what do we calculate when they are lumped together like \partial X^{\mu}\partial X^{\nu}?
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