Homotopy classes appendix in Weinberg's QFT book, Part I

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The discussion centers on challenges faced by users in understanding specific formulas from Weinberg's trilogy on Quantum Field Theory (QFT). Pierre seeks help with Formula 2.B.10, expressing frustration after grasping Formula 2.B.7. Philipp also struggles with Formula 2.B.7 and requests clarification on how it is derived. Both participants are self-studying QFT and are looking for guidance on these technical mathematical points. The conversation highlights the difficulties in mastering complex concepts within advanced physics literature.
jouvelot@cri.ensmp.fr
Hi,

I'm trying to teach myself QFT, and I'm stuck with one formula in Part
I of Weinberg's trilogy.

I think I managed to understand how one gets Formula 2.B.7 in the
appendix of Chapter 2, thanks to the information provided by Weinberg,
but don't get 2.B.10, page 97. Could anyone one give me a hint on how
to get it? FWIW, I'm using the paperback edition.

Since this is not key issue, but mostly a technical mathematical point,
I wouldn't want to get bogged down too long by this, but this is
getting irritating :-)

TIA,

Pierre
 
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hi,

i am also trying to do the same as you do. but I got stucked on the formula (2.B.7). It seems that you have the answer, could you please provide me with that one. I am not sure what is really done to achieve this result in (2.B.7).

greets

- philipp
 

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