Meaning of the symbol in the equation

2013 8 22
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Please can someone tell me what the ||equation||2 symbol denotes in the equation given the link.... Please do reply.... Please can anyone help me to code that line... i dont know what that symbol ||equation||2 stands for..... Please do reply what is the meaning of
||y(x,n)......||2
Please do reply.....

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Jan
Jan 2013-8-22

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you are looking at the square of a vector norm:
|v|||^2 = sqrt( v_1^2 + v_2^2 + ... + v_n^2 ) = v_1^2 + v_2^2 + ... + v_n^2

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