Recent content by Ineedhelpimbadatphys

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    Problems with the Riemann tensor in general relativity

    The sentence after (3.71) was a little unclear. I meant that I do know how to derive (3.71) using equations (2).
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    Problems with the Riemann tensor in general relativity

    After Taylor expansion and using equations (2), I have no problem getting to equation (1). Now obviously I have to somehow use (3.71) ,which I do know how, to derive to express the second order derivative. On the internet I found equation (3), and I have tried to understand where this comes from...
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    New to the Einstein notation, having trouble with basic calculations

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    Help with a simple group theory question please

    above
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    What is meant by compex dimension? (Abstract algebra)

    Sorry, this was supposed to be a reply. Im really not understanding the subject so sorry for simple questions.
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    What is meant by compex dimension? (Abstract algebra)

    There are two independant scalars in a complex number. So does that mean 2n.
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    What is meant by compex dimension? (Abstract algebra)

    picture since the text is a little hard to read i have no problem showing this is a vector space, but what is meant by complex dimention? Is it just the number on independant complex numbers, so n?
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    Quantum Mechanics problem: Determine the value of the constant

    Thank you so much. I did actually manage to figure it out. I had tried calculatibg that, and got stuck at < E_0 | XHX | E_n > and assumed I was wrong. After seeing this, I just kept trying and got it. thank you.
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    Quantum Mechanics problem: Determine the value of the constant

    I have no idea where to start with this problem. I am interested in any hints, or ways to proof this. But i would especially like to know how the commutator is connected to the identity.