Erkenntnis 52 (1):93-108 (2000)
John Leslie presents a thought experiment to show that chances are sometimes observer-relative in a paradoxical way. The pivotal assumption in his argument – a version of the weak anthropic principle – is the same as the one used to get the disturbing Doomsday argument off the ground. I show that Leslie's thought experiment trades on the sense/reference ambiguity and is fallacious. I then describe a related case where chances are observer-relative in an interesting way. But not in a paradoxical way. The result can be generalized: At least for a very wide range of cases, the weak anthropic principle does not giverise to paradoxical observer-relative chances. This finding could be taken to give new indirect support to the doomsday argument.
|Keywords||Philosophy Philosophy Epistemology Ethics Logic Ontology|
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Agreement Theorems for Self-Locating Belief.Michael Caie - 2016 - Review of Symbolic Logic 9 (2):380-407.
Agreement and Updating for Self-Locating Belief.Michael Caie - forthcoming - Journal of Philosophical Logic:1-35.
The Doomsday Argument and the Self–Indication Assumption: Reply to Olum.Nick Bostrom & Milan M. Cirković - 2003 - Philosophical Quarterly 53 (210):83–91.
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