Recent content by Adwit

  1. Adwit

    From General Relativity to Dark Energy

    Here is my own effort. Now, will you please tell me where I went wrong? What do I have to do?
  2. Adwit

    From General Relativity to Dark Energy

    If we insert the values from (2.9), (2.10), (2.11) into (2.5) & (2.6) how can we get (2.13) & (2.14) ?? I need to see the calculations step by step.
  3. Adwit

    Graduate Quantum Field Theory: 3-4 Equation Steps Explained

    Ok, this is the last time I posted image of calculation. For now, I will write the calculation. Now, can you do the steps between 3 no. equation and 4 no. equation ?
  4. Adwit

    Graduate Quantum Field Theory: 3-4 Equation Steps Explained

    I understand how do 3 no. equation come from 1 & 2 no. equation. But I am struggling to understand how do 4 no. equation come from 3 no. equation. Will anyone do the steps between 3 no. equation and 4 no. equation, please ?
  5. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    In the picture, ρ is not written. I didn't know either ρ is the connector line from the origin to point B or A or it is any other line ? I didn't know which line is ρ . I wanted to know which line indicates ρ .
  6. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    Of course, distance is a thing you can see. When I draw a line which connects two points, that line is the distance either it is in hyperbola or circle. That is what I mean by saying " we see distance". Understand? That pictured line is the distance. Everybody in the world thinks that the...
  7. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    Gaussian97 , In the case of circle geometry, we see distance r. Where is the distance ρ in hyperbola picture? Is it from the origin point to point B ? Now I hope you understand my question.
  8. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    Gaussian97, Of course, there was math to be done. This is the math.
  9. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    vanhees71, I know your math. I just want to know where is ρ in the picture of the hyperbola ? In the case of circle geometry, we see distance r. Where is the distance ρ? Is it from the origin point to point B ?
  10. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    I do the math. Constant becomes 1. But the screenshot of my question shows that constant is some kind of squared distance ρ ^2. Can you show me where is this distance in the hyperbola picture?
  11. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    Don't bring special relativity or any physics ( ct or Lorentz transformation ) in here. I want to see the problem from the mathematical perspective, not physics perspective. Where do I find the derivation of distance formula of hyperbola? Forget physics. How do I derive it mathematically?
  12. Adwit

    Undergrad How Do You Derive the Distance Formula for a Hyperbola?

    Can anyone derive the distance formula of a hyperbola for me, please? I have not found the derivation on the internet. I can't get any clue from the picture of hyperbola.
  13. Adwit

    Undergrad Rotation problem in Quantum Mechanics

    With all due respect hilbert2, isn't the plus sign of 1st "sinϕ expansion" actually going to be minus sign? I indicate it with red colour. By the way, thanks for your explanation.
  14. Adwit

    Undergrad Rotation problem in Quantum Mechanics

    What does it mean ? I recognize phi. But what is this symbol that looks like O ? I have never seen this in my life.
  15. Adwit

    Undergrad Rotation problem in Quantum Mechanics

    How do "sinϕ - cosϕ sinϕ" become 0 ?