February 5, 2020
Al-Ghazali on Skepticism
I'm currently reading Al-Ghazali's spiritual/philosophical autobiography for the first time. The translation I found in the library gives the title as Freedom and Fulfillment, but the book is better known in English as Deliverance From Error. I'm sure this has been noticed before, but the discussion of skepticism near the beginning of the book can be interestingly compared with some of the well-known discussions of skepticism in European philosophy. Here's a quick outline. Al-Ghazali states that he is looking for a kind of "certain knowledge" that will guarantee "safety from error" (ยง8). He recognizes that "the dicta of authority" (i.e.,...
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January 23, 2009
How Putnam Defeats Descartes' Demon
A little while back, I wrote a post describing Cartesian demon skepticism as a form of
'adversarial epistemology'. The idea is that Descartes' thought experiment can be conceived of as a game with two players: the meditator and the demon. The meditator selects a process for forming beliefs from perceptual experiences, and the demon knows what process the meditator has selected, and controls all of the perceptual experiences. If the meditator ends up with mostly true beliefs, she wins. Otherwise, the demon wins.
Now, I mentioned at the bottom of that post that this way of framing the problem is helpful...
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December 22, 2008
Cartesian Demon Skepticism as 'Adversarial Epistemology'
In one of my computer science classes in undergrad, we discussed a particular way of thinking about the efficiency of an algorithm, which the professor called 'adversarial upper bounds'. The idea was to suppose that someone knows the 'guts' of your algorithm - exactly how it works - and that person is trying to make your algorithm take as many steps to complete as possible. The upshot was that sometimes with this kind of system inserting some randomness will give you a better expectation value. For instance, suppose I am trying to find a route (just any route) from A...
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