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My critique of David Deutsch’s The Beginning of Infinity as a programmer. In short, his ‘hard to vary’ criterion is fatally underspecified and impossible to apply. He says you haven’t understood a computational task if you can’t program it. He can’t program the steps for finding out how ‘hard to vary’ an explanation is, so by his own yardstick, he hasn’t understood his epistemology.

https://blog.dennishackethal.com/posts/hard-to-vary-or-hardly-usable