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- From: sundar+@cs.cmu.edu (Sundar Vallinayagam)
- Newsgroups: sci.math
- Subject: Re: Littlewood's Three Principles
- Summary: Quote from Royden's "Real Analysis"
- Keywords: Littlewood's Three Principles
- Message-ID: <1992Aug12.202440.139621@cs.cmu.edu>
- Date: 12 Aug 92 20:24:40 GMT
- References: <16bjm1INNesk@function.mps.ohio-state.edu>
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- Organization: School of Computer Science, Carnegie Mellon
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-
- Gerald Edgar queries,
-
- >Where do I find the original (published) formulation of Littlewood's
- >three principles, or at least a verbatum statement of them?
-
- The following is from Royden's "Real Analysis" (3rd edition), p. 72
-
- 6. Littlwood's Three Principles
-
- Speaking of the theory of functions of a real variable, J.E. Littlewood
- says, ^6 "The extent of knowledge required is nothing like so great
- as is sometimes supposed. There are three principles, roughly expressible
- in following terms: Every (measurable) set is nearly a finite union of
- intervals; every [measurable] function is nearly continous; every convergent
- sequence of [measurable] functions is nearly uniformly convergent. Most of
- the results of [the theory] are fairly intuitive applications of these ideas,
- and the student armed with them should be equal to most occasions when real
- variable theory is called for. If one of the principles would be the obvious
- means to settle the problem if it were `quite' true, it is natural to ask
- if the `nearly' is near enough, and for a problem that is actually solvable
- it generally is."
-
- Footnote 6 gives the reference as [20], p. 26. I think it is a typo
- and the reference should actually be [21], which is: J.E. Littlewood, "Lectures
- on the Theory of Functions", Oxford, 1944.
-
- Hope this helps.
-
- Ramli.
-
-
-
-
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