 Others dispute that Brouwer’s lecture influenced Wittgenstein’s thinking (Hacker 1986, Hintikka 1992, Marion 2003). In how far, if at all, Wittgenstein was influenced by Brouwer’s ideas is not entirely clear, but there certainly are interesting agreements and disagreements between their views. Marion (2003) argues that Wittgenstein’s conception of mathematics as described in the Tractatus is very close to that of Brouwer, and that Wittgenstein agrees with the rejection of the Law of Excluded Middle (1929 manuscript, pp 155–156 in Wittgenstein 1994) but disagrees with Brouwer’s arguments against it. Marion (2003) claims that Wittgenstein’s stance is more radical than Brouwer’s in that in the former’s view the lack of validity of the Law of Excluded Middle in mathematics is a distinguishing feature of all mathematical propositions (as opposed to empirical propositions) and not only a particularity of the mathematics of the infinite, as it is for Brouwer.