The full text can be found here, with all 61 signatories.
“We, the undersigned members of the Department of Mathematics at UC Berkeley, strongly condemn the actions of the UC Berkeley and Alameda County police forces on Wednesday, November 9. It is our assessment that officers in those forces attacked students who were plainly not engaged in violent activity. We maintain that the use of violence against peaceful protesters is not justified. Therefore, we ask that Chancellor Robert Birgeneau, on behalf of the University community, rescind his message of November 10 condoning the conduct of the police. We call upon the Chancellor to take all necessary steps to ensure that the campus police never again attack unarmed students engaged in peaceful protest.”