Homework Help Overview
The discussion revolves around a quantum mechanics problem involving a complete and orthonormal basis for a system. The original poster questions the validity of an expression involving inner products and the insertion of the identity operator in the context of this basis.
Discussion Character
- Conceptual clarification, Assumption checking
Approaches and Questions Raised
- The original poster attempts to confirm if the expression Ʃ(j) equals under the assumption that |k> and |i> are elements of the orthonormal basis. Some participants suggest that the orthonormality condition implies equals zero when k does not equal i, questioning the need for the identity insertion.
Discussion Status
Participants are exploring the implications of the orthonormality of the basis and the correctness of the expression in question. There is acknowledgment of the original poster's clarification regarding |k> and |i>, and some guidance is provided regarding the summation over the complete basis.
Contextual Notes
There is an emphasis on the need for clarity regarding the elements of the basis being discussed, as well as the implications of the orthonormality condition on the inner products involved.