%0 Journal Article %T Beurling's Theorem for $SL(2,\R)$ %A Rudra p Sarkar %A Jyoti Sengupta %J Mathematics %D 2006 %I arXiv %X We prove Beurling's theorem for the full group $SL(2,\R)$. This is the {\em master theorem} in the quantitative uncertainty principle as all the other theorems of this genre follow from it. %U http://arxiv.org/abs/math/0612775v1