At Physics IV,8, 216a26-7, Aristotle cracks a joke. It is one of the relatively few deliberate jokes in the corpus, and its occurrence here is not without significance. Aristotle in these chapters is arguing against those who believe in the existence of the void, or vacuum, or empty space; he says, ‘even if we consider it on its own merits the so-called vacuum will be found to be really vacuous.'

To be sure, this is not a very funny joke; what is interesting about it, though, is that it underlines the general attitude of dismissive flippancy that seems to run through Aristotle's consideration of the void. He seems to refuse to take the hypothesis of the void at all seriously. He never argues directly that the void does not or cannot exist, but contents himself with criticizing the arguments that other thinkers had advanced in its favour.

There is an interpretation of Parmenides’poem which has not yet had, but deserves, a hearing. It reconciles two of the most prominent views of the meaning of the verb ‘to be’ (‘ε ἷναι’) as it occurs in the poem. It agrees with the spirit of those who interpret ‘εἷναι’ as‘existence.’ It agrees with the letter of those who interpret ‘εἷν αι’ as the copula.

Though consequentialist theories of political obligation have been widely criticized in recent years, a series of arguments presented by Derek Parfit, in Reasons and Persons, are now believed to have given this position new life.

According to the ideal of tolerance, the state is supposed to be neutral or evenhanded in its dealings with religious sects and doctrines. The tolerant state does not pursue policies aimed at favoring one sect over another.

While Friedrich Schleiermacher‘s thought has been of overwhelming importance for theology during the nineteenth and twentieth centuries, his influence as a philosopher is much more circumscribed and as a social and political thinker it is almost nil.

Philosophers since the ancient Greeks have investigated the nature of different kinds of inference. Although deductive inference in the form of Aristotelian syllogisms and Fregean formal logic has predominated, much attention has also been paid to induction, inference where the conclusion does not follow necessarily from the premises.