What does $\ll$ mean? I saw two less than signs on this Wikipedia article and I was wonder what they meant mathematically.
http://en.wikipedia.org/wiki/German_tank_problem
EDIT: It looks like this can use TeX commands. So I think this is the symbol: $\ll$

"$a\ll b$" can also mean "$a$ at least as smaller than $b$ as it is needed for my arguments to be true".
It is in that sense that one sometimes writes, for example, "let $x$ be such that $0< x\ll 1$" to mean "let $x$ be a positive number as small as needed for the following to hold".
