- #1
pdxautodidact
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Homework Statement
Verify ##\left[ x^{i} , p_{k}\right] = i \hbar \delta^{i}_{k}##
Homework Equations
## p_{j} = -i \hbar \partial_{j}##
The Attempt at a Solution
Writing it out i get
$$ i \hbar \left( \partial_{k} x^{j} - x^{j} \partial_{k} \right)$$
The Kronecker makes perfect sense, it's identically zero unless k=j. Assuming it does, I arrive at:
$$ i \hbar \delta^{j}_{k} \left( \partial_{k} x^{j} - x^{j} \partial_{k} \right)$$
I assume I am missing something obvious, because most of the problem in this book are pretty straight forward, but this one's been a pain. I'm not doing any coursework, I already did my undergrad and am in limbo.
*Note Einstein convention is in use*
cheers.