Lowering and Raising Kronecker Delta - Physics Stack Exchange
In nonrelativistic quantum theory Dirac delta distributions might be used e.g. for orthogonality relations between eigenstates, just like the Kronecker delta, but this, in turn, has nothing to do …
Kronecker delta confusion - Physics Stack Exchange
I'm confused about the Kronecker delta. In the context of four-dimensional spacetime, multiplying the metric tensor by its inverse, I've seen (where the upstairs and downstairs indices are the …
quantum mechanics - Understanding kronecker delta function
2022年1月22日 · You need to be careful with your summation indicies and bra/ket ordering. You can't sum over the index that you've already got in your expression for one \begin{align*} …
Summation notation for Kronecker delta - Physics Stack Exchange
Summation notation for Kronecker delta. Ask Question Asked 9 years, 7 months ago.
homework and exercises - Covariant Derivative of Kronecker Delta ...
2016年5月31日 · The partial derivatives $\partial_\lambda \delta^\mu_\nu$ are clearly zero because the components of the Kronecker delta are constant functions of spacetime …
Raising and lowering indices of Kronecker delta [duplicate]
2024年3月31日 · where $\delta_{\mu}^{\ \nu}$ are the components of the Kronecker delta, that result to be the components of the identity tensor in mixed base. Using the "law for raising or …
definition - Dirac delta function and Kronecker delta function ...
2020年3月26日 · You can see it as if the delta distribution/function is the continuous variant of the Kronecker delta, but don't take it too far as it breaks down once it's out of an integral. Share Cite
What is the difference between Dirac delta function orthogonality …
2022年8月30日 · In the derivation of Bloch Wave, I encountered a problem. First of all this is the definition of Bloch Wave： $$ \\psi_{n\\mathbf{k}} (\\mathbf{r} ) = e^{i\\mathbf{k ...
Orthonormal Basis integration and Kronecker delta
2018年8月21日 · The Kronecker Delta in a sum acts like the Dirac Delta function in an integral. So basically you can drop the sums and remove the delta terms. Your integral will be the …
special relativity - Proof that Kronecker's Delta is invariant under ...
2021年9月19日 · There's an exercise in my book that says "Prove that the Kronecker $\\delta$ is invariant under Lorentz transformations". The solution says that from the …