Let us divide the time $T$ into $N$ segments each lasting $δt = T/N$. Then we write $\langle q_F | e^{−iHT} |q_I \rangle = \langle q_F | e^{−iHδt} e^{−iHδt} . . . e^{−iHδt} |q_I \rangle $ Our states are normalized by $\langle q' | q \rangle = δ(q' − q)$ with $δ$ the Dirac delta function. ("Dirac's formulation, in the book "Quantum Field Theory" by A. Zee)
1) Why must $\langle q' | q \rangle = δ(q' − q)$ hold?
2) Is this related to $\int_{-\infty}^{\infty}\Psi^*\Psi dx = 1$?
Also,
Now use the fact that $|q \rangle$ forms a complete set of states so that $\int dq |q \rangle \langle q| = 1$.
3) Does this even make sense?
4) Shouldn't integral be $\int_{-\infty}^{\infty}$?
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