MHB Lower Central Series: Meaning of Gamma of G

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In definition of lower central series we use the notation called ,gamma of G, what is meaning of this gamma of G ? please help...
 
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Hi,

Do you refer the notation in wiki?
Central series - Wikipedia, the free encyclopedia

There, $\gamma_{n}(G)=G_{n}$ it's just a description notation, I mean, this is like when you take a sequence and write $a_{n}=(whatever)$ but in this case, as the lower central series of a group is unique we can think in an "operator" family ($\gamma_{n}$) that sends every group to the $n-$th term of his lower central series ($G_{n}$).
 

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