# What this means ?

i can see the mean of "[]" in the first row,it is the anticommunicater between \gamma{\mu} and \gamma{\nu}, but what it mean in the second row and the third?

thanks

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• p0071-sel.jpg
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that means that the indicies should be antisymmetrized,

from the first you see it is a DEFINITION of the anticommutator, so you should be able to figure out what the third and second line is :)

thanks ，i found it in weinberges book vol.1

thanks ，i found it in weinberges book vol.1

cool, the image you posted is from Peskin right?

cool, the image you posted is from Peskin right?

that is right,and peskin had learnt from weinberge,hh

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