Meaning of \gamma{\mu}, \gamma{\nu} in Rows 1,2,3

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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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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 weinberge`s book vol.1
 
sunkesheng said:
thanks ，i found it in weinberge`s book vol.1

cool, the image you posted is from Peskin right?
 
ansgar said:
cool, the image you posted is from Peskin right?

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