Many do, but then the colon isn't correctly centered. Better to use the package mathtools and \coloneqq. See the mathtools documentation for more information.

LaTeX symbols in MediaWiki. LaTeX equations always start with \(and end with \) Some of the following symbols require \usepackage{amssymb} in the.

To change the symbol printed at the end of a proof is straightforward. \ documentclass{article}.