pg. 99

[alextzik]

x^(2) is not the argmin over x1, but rather:

x^(2) = (argmin_x1 f(x1, x2^(1),..., xn^(1)), x2^(1), ..., xn^(1))

[tawheeler]

Hmm, you are right. I'll add a superscript for the coordinate index.