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

    A 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

    A 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I 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

    I Rotation problem in Quantum Mechanics

    How do "sinϕ - cosϕ sinϕ" become 0 ?
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