Michael J. Raven

Aristotelian relativism about the future (as recently defended by MacFarlane ( 2003 )) claims that a prediction made on Monday, such as ‘It will rain’, can be indeterminate on Monday but determinate on Tuesday. A serious objection to this intuitively appealing view is that it cannot coherently be attested: for if it is attested on Monday, then our blindness to what the future holds precludes attesting that the prediction is determinate on Tuesday, and if it is attested on Tuesday (when, suppose, it rains), then the fact that it rains precludes attesting that the prediction is indeterminate on Monday. In this paper, I focus on Moruzzi and Wright ( 2009 )’s recent development of this objection and argue that it fails. This result removes a major obstacle to defending the Aristotelian view

I defend (metaphysical) ground against recent, unanswered objections aiming to dismiss it from serious philosophical inquiry. Interest in ground stems from its role in the venerable metaphysical project of identifying which facts hold in virtue of others. Recent work on ground focuses on regimenting it. But many reject ground itself, seeing regimentation as yet another misguided attempt to regiment a bad idea (like phlogiston or astrology). I defend ground directly against objections that it is confused, incoherent, or fruitless. This vindicates the very attempt to regiment ground. It also refocuses our attention on the genuine open questions about ground and away from the distracting, unpersuasive reasons for dismissing them

There is a long history of cryptographic hash functions, i.e. functions mapping variable-length strings to fixed-length strings, and such functions are also expected to enjoy certain security properties. Hash functions can be effected via modular arithmetic, permutation-based schemes, chaotic mixing, and so on. Herein we introduce the notion of an artificial-life (ALife) hash function (ALHF), whereby the requisite mixing action of a good hash function is accomplished via ALife rules that give rise to complex evolution of a given system. Various security tests have been run, and the results reported for examples of ALHFs.