Timeline for How to prove that $\sum_{n=1}^{\infty} | \phi_n \rangle \langle \phi_n | = \hat {I}$?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Nov 23, 2020 at 21:01 | history | edited | G. Smith | CC BY-SA 4.0 |
added 42 characters in body; edited title
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| Nov 23, 2020 at 20:14 | vote | accept | Abdul Qadeer | ||
| Nov 23, 2020 at 20:13 | history | edited | Charlie | CC BY-SA 4.0 |
edited title
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| Nov 23, 2020 at 20:07 | answer | added | Charlie | timeline score: 3 | |
| Nov 23, 2020 at 20:00 | history | edited | Abdul Qadeer | CC BY-SA 4.0 |
edited title
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| Nov 23, 2020 at 19:59 | comment | added | Abdul Qadeer | The kronecker Delta forces the summation to take only one value and we can take another summation from both sides to get our $\psi$ again. Thank you. | |
| Nov 23, 2020 at 19:51 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
added 2 characters in body
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| Nov 23, 2020 at 19:46 | comment | added | RogerJBarlow | Any state $|\psi >$ can be written as $\sum a_n |\phi_n>$, as the set is a basis. Now apply your operator and use orthonormality. | |
| Nov 23, 2020 at 19:41 | history | asked | Abdul Qadeer | CC BY-SA 4.0 |