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- Path: sparky!uunet!stanford.edu!rutgers!cmcl2!panix!spencer
- From: spencer@panix.com (David Spencer)
- Newsgroups: comp.misc
- Subject: Re: What is Occam's Razor
- Message-ID: <1992Aug20.191842.9415@panix.com>
- Date: 20 Aug 92 19:18:42 GMT
- References: <6291@ucru2.ucr.edu> <16s1ibINN1uj@early-bird.think.com>
- Organization: PANIX Public Access Unix, NYC
- Lines: 35
-
- barmar@think.com (Barry Margolin) writes:
-
- >Occam's Razor is the rule that the simplest theory that accurately explains
- >all the facts is the one that should be accepted.
-
- To be exact, "Entia non sunt multiplicanda praeter necessitatem", or,
- in Occam's native language, "Entities should not be multiplied without
- necessity." If I recall correctly, Occam never said this in so many
- words, but this is the standard statement of the Razor.
-
- In other words, use the simplest _set of postulates_ necessary to
- explain a phenomenon.
-
- >For instance, when
- >explaining the apparent motion of the planets in the night sky, there were
- >two competing theories: Earth-centered and Sun-centered. The latter was
- >accepted because its elliptical orbits are much simpler than the former's
- >complex arrangement of epicycles.
-
- I'm not sure that's a good example. Both can be derived from the same
- _set of postulates_. The calculation's just simpler if you change the
- coordinates. (Or is calculation an entity? Is this point scholastic?
- Why can't one find a good nominalist when one needs one?)
-
- Perhaps a better example is that one should avoid the Axiom of Choice
- when it's not necessary to a proof, or that Newtonian mechanics wasn't
- abandoned until physicists found phenomena that it couldn't explain.
-
- Quine has a fairly amusing line about being, nonbeing, Plato's beard
- and Occam's Razor, but I don't remember it ....
-
-
- dhs spencer@panix.com
- "Upon reading Goethe, I am always struck by the paralyzing
- suspicion that he is trying to be funny" - Waugh
-