Recent content by grzz

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    I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics

    A very big thank you to robphy. .
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    I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics

    I was forbidden to enter the given url. Thanks anyway.
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    I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics

    I am reading the transcript of the talk in the pdf mentioned above. A few days ago I found online a copy of handwritten notes (by the great Dirac himself or perhaps by Hart) where there were some diagrams mentioned in the transcript. But unfortunately I did not save these handwritten notes! I...
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    I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics

    https://atomicprecision.com/Topics/Paul%20Dirac%20Talk%20-%20Projective%20Geometry.pdf
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    I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics

    Where can I find the diagrams mentioned in the transcript of this talk? Thanks.
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    How to obtain these equations in 'Spinors in Physics' by J Hladik?

    Now I notice that the, apparently arbitrary, choice in 1.1.12 was made as a preparation for 1.1.24.
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    How to obtain these equations in 'Spinors in Physics' by J Hladik?

    I want to tell you that your last reply was a comfort to me. And now when I continued to, I was wondering why was this particular choice made. Does one arrive at this choice by trial and error in order to obtain some desired result? Any ideas? Thanks.
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    How to obtain these equations in 'Spinors in Physics' by J Hladik?

    I want to KICK myself! All I had to do was, just multiplying the RHS of the equations 1.1.9 by which is equal to 1. Thanks TSny.
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    How to obtain these equations in 'Spinors in Physics' by J Hladik?

    From the book Spinors in Physics by J Hladik: I understood up to equations 1.1.10. From 1.1.10 the vectors X1 and X2 depend on vector X3. But the point represented by X3 is projected stereographically to the point represented by the complex number in 1.1.4. I understand that x3=y1z2 -...
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    I Quaternions and Special Relativity

    Here is p26 A big THANK YOU to you too, mma.
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    I Quaternions and Special Relativity

    A big THANK YOU! I am trying to read J L Synge book, though sometimes I am finding it rather difficult to follow.
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    I Quaternions and Special Relativity

    Is it possible for somebody to send me p26 of the above book by J L Synge because this page in my copy is very faint. Thanks
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    I Quaternions and Special Relativity

    My interest is not to start learning SR using quaternions. But, having learnt a bit of SR using four-vectors, one may feel inclined to see how this can be done using quaternions. From the above replies it seems that quaternions were not laid to rest for ever. For example, did quaternions find...
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    I Quaternions and Special Relativity

    Is it worthwhile for a retired highschool teacher of Physics to learn the STOR using quaternions?
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    I How does one find the dual of a matrix?

    I am not familiar with Lie Algebra. But thanks any way.