Why is it that the genetic "distance" between two populations would be determined by the angle between their position vectors rather than the magnitude of their respective displacements? [more inside]
posted by PuGZ on Mar 8, 2008 - 10 answers

Finding the magnitude of a complex fraction. Is it simply |num|/|denom|? Or is there more to it? [more inside]
posted by toomanyplugs on Nov 4, 2007 - 4 answers