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(Weinberg QFT, Vol 1, page 68)

He considers Mass-Positive-Definite, in which case the Little Group is SO(3). He then gives the relations

Is it difficult to derive these relations? I'm asking this mainly because I haven't seen them anywhere other than in Weinberg's book.

Also, I'm finding them difficult to follow, as on one side of the equations the ##J## have two indices whereas on the other side they have only one index.

He considers Mass-Positive-Definite, in which case the Little Group is SO(3). He then gives the relations

Is it difficult to derive these relations? I'm asking this mainly because I haven't seen them anywhere other than in Weinberg's book.

Also, I'm finding them difficult to follow, as on one side of the equations the ##J## have two indices whereas on the other side they have only one index.

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