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- From: sasghm@theseus.unx.sas.com (Gary Merrill)
- Subject: Re: Natural Kinds (was re: Are all crows black?)
- Originator: sasghm@theseus.unx.sas.com
- Sender: news@unx.sas.com (Noter of Newsworthy Events)
- Message-ID: <Bx998I.KpK@unx.sas.com>
- Date: Thu, 5 Nov 1992 18:12:18 GMT
- References: <1992Nov4.163618.17991@dcs.qmw.ac.uk> <1992Nov4.200546.2196@CSD-NewsHost.Stanford.EDU> <Bx8yvo.6ty@unx.sas.com> <1992Nov5.171453.22237@CSD-NewsHost.Stanford.EDU>
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- Lines: 54
-
-
- Just some quick responses to an otherwise very long posting ...
-
- In article <1992Nov5.171453.22237@CSD-NewsHost.Stanford.EDU>, pratt@Sunburn.Stanford.EDU (Vaughan R. Pratt) writes:
-
- > Now what I claimed in (B) was that hypotheses can be falsified in
- > math. Here Liebniz' hypothesis of the mathematical existence of
- > infinitesimals, later endorsed by Cauchy, was eventually *falsified* by
- > Dedekind. (You can *prove* via reals as cuts that no real can be an
- > infinitesimal, the only reals greater than 0 are too large to be
- > infinitesimals.) And my evidence for (C), the impermanence of
- > falsification, is Robinson's restoration of infinitesimals to
- > mathematically rigorous existence.
-
- There is at least a real confusion here about *what* was "falsified".
- It appears, at least from this story, that one *semantics* for
- a theory of infinitesimals was "falsified", while another semantics
- (perhaps even for an at least slightly *different* theory) was not.
-
- This story has a bit of the flavor of the claim that the existence
- of phlogiston (the "active ingredient" in combustion) was falsified,
- but that this (phlogistion) later really turned out to be oxygen!
-
- >
- > The parallels with the corresponding story for particles and waves
- > involve both (B) and (C) with physics in place of mathematics. These
- > intimate parallels makes it *very* hard to tease apart the processes of
- > mathematics and physics in any useful way.
-
- It remains not hard at all. You may choose to attempt to minimize the
- issue of direct empirical content as well as the significant methodological
- differences, but these differences are nonetheless quite obvious.
-
- You can take a mathematician and lock him in his little office with just
- some writing materials and he will (a) be pretty happy, and (b) be able
- and willing to do anything of a mathematical nature. Even a committed
- *theoretical* physicist will be very distressed under such circumstances
- since he has not way to determining whether his theories (however abstract)
- are *good* ones.
-
- > The divergence between Natural Philosophy and Philosophy grew as the value
- > of knowing how many people a bridge could hold became economically more
- > important than knowing the number of angels that could fit on a pin ;-)
- >
-
- I take this as an expression of some kind of ideology. Certainly it is
- not historically accurate. The divergence has much more to do with the
- development of *quantitative* methods and measurements, and (to use
- a phrase beloved by some in the history of ideas and history of
- philosophy) "the mechanization of the world picture".
- --
- Gary H. Merrill [Principal Systems Developer, C Compiler Development]
- SAS Institute Inc. / SAS Campus Dr. / Cary, NC 27513 / (919) 677-8000
- sasghm@theseus.unx.sas.com ... !mcnc!sas!sasghm
-