5 ms·

I guess what I'm wondering is, how could you possibly expect to do better? You told me why the result is bad, but gave no intuition on why I should expect bette

• tlb 10y ago
  The simple trick is to take pairs of bits. If you get 01, output 0. If you get 10, output 1. Otherwise, output nothing. Even if the source is biased (as long as successive bits are uncorrelated), you get an unbiased 50:50 output. But obviously you get fewer bits out than you put in. The construction in the paper is basically a more efficient version of this.