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- Path: sparky!uunet!dtix!darwin.sura.net!ukma!cyeomans
- From: cyeomans@ms.uky.edu (Charles Yeomans)
- Newsgroups: sci.math
- Subject: Re: Square root
- Message-ID: <1992Nov21.110607.27232@ms.uky.edu>
- Date: 21 Nov 92 16:06:07 GMT
- References: <n9146070.722056383@waldorf>
- <By1A7t.3o@undergrad.math.waterloo.edu>
- Organization: University Of Kentucky, Dept. of Math Sciences
- Lines: 14
-
- In article <By1A7t.3o@undergrad.math.waterloo.edu> kekamins@zeno26.math.UWaterloo.ca (kekaminsky) writes:
- >In article <n9146070.722056383@waldorf> n9146070@waldorf.cc.wwu.edu (Jacob C Kesinger) writes:
- >>There was a previous post about ways to find the square root of a number...
- >>
- The following technique is, I imagine, well-known. I like it because I
- found it for myself in 9th grade or so.
-
- Define two sequences a(k) and b(k) as follows: Set a(1) = a, b(1) = 1.
- Then define a(k) = [a(k-1) + b(k-1)])/2, b(k) = a/a(k). Then one checks
- that the two sequences a(k) and b(k) converge to sqrt(a).
-
- Charles Yeomans
- cyeomans@ms.uky.edu
- yeomans@austin.onu.edu
-