Recent content by Peter Yu

Sorry I do not know. Can you give me some hints.

Thank you for your response. Can you enlighten me on the approach.

Hi All, I try to prove the following commutator operator Identity used in Harmonic Oscillator of Quantum Mechanics. In the process, I do not know how to proceed forward. I need help to complete my proof. Many Thanks.

Hi Shyan and Dyatloc, Heartfelt thank for your assistance. I need some time to absorb your explanation. Many Thanks Peter

Hi All, I have spent hours trying to understand the matrix form of Density Operator. But, I fail. Please see page 2 of the attached file. (from the book "Quantum Mechanics - The Theoretical Minimum" page 199). Most appreciated if someone could enlighten me this. Many thanks in advance. Peter Yu

Hi Shyan, Many Many thank for your help! Regards, Peter Yu

Hi All, I have problem in understanding one step in the derivation of the time dependent Schrodinger Equation. Please see attached file page 2 (marked in red). Most grateful if someone can help! Peter Yu (This is from Quantum Mechanics The Theoretical Minimum Page 99-102)

Hi All, I got it now! Thank you very much for your help! Regards!

Hi DrClaude, First of all many thanks for your kind assistance. I do not understand both side. Regards, Peter Yu

Hi All, Thank you very much your all your help! Now I understand the first part on the first page. But I still have difficulty on the second part on the second page of my attached file. Thank again! Peter Yu

I have difficulty in understanding the Density Operator. Please see attached file. (From the Book " Quantum Mechanics Demystified Page 250) Most grateful if someone could help! Here is the attached file! Peter Yu

I have difficulty in understanding the Density Operator. Please see attached file. (From the Book " Quantum Mechanics Demystified Page 250) Most grateful if someone could help! Peter Yu

Hi Steven, I do not know the Latex code. Can you write a fraction (in your equation) by using the edit window bar? And how can use the X squared icon in the edit window bar? Thanks

Hi Steven, Thank you. You are smart! I think you are right! By the way, how do you input your equation in the above message? I cannot input the equation using the key board.

Hi Elite, Many thank! I still cannot understand. Perhaps this can help: If : | f > = |a > - < b | a> ( | b >) Then: < f | = ??