Vanish 5.254 An operation can vanish (e.g. negation in '~~p' : ~~p = p). - Wittgenstein, Tractatus Logico-Philosophicus http://www.alansondheim.org/emptied.jpg 5.0022 Only operations can vanish (e.g. negation in ~~p). - Wittgenstein, Prototractatus http://www.alansondheim.org/emptied.jpg