sentences:  His philosophical ideas were deeply influenced by the writings of Immanuel Kant, Gottlob Frege and Karl Popper, and to a lesser extent by John Austin, Gilbert Ryle, R. M. Hare (who, as his 'personal tutor' at Balliol College discussed meta-ethics with him), Imre Lakatos and Ludwig Wittgenstein.What he could learn from philosophers left large gaps, which he decided around 1970 research in artificial intelligence might fill.E.g.