Recall that a density $\varphi$ is said to be $\epsilon$-biased if its correlation with every ${\mathbb F}_2$-linear function $f$ is at most $\epsilon$ in magnitude. In the lingo of pseudorandomness, one says that $\varphi$ fools the class of ${\mathbb F}_2$-linear functions:

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Ryan O'Donnell: Thanks!Ryan O'Donnell: Yeah, Chapter 13 doesn't exist. :( On the bright side, the ...Kirill Elagin: “In Chapter 13 we will show” =(Kirill Elagin: Typo (examples 22, bullet 2): “task is to fund”.Ryan O'Donnell: Argh! I specifically remember double-checking your name. G...Gautam Kamath: Thanks, I will wear this title with pride! As another (in...Ryan O'Donnell: Thanks Mom! For you, a free copy :)