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- Path: sparky!uunet!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!torn!watserv2.uwaterloo.ca!watserv1!graceland.uwaterloo.ca!shallit
- From: shallit@graceland.uwaterloo.ca (Jeffrey Shallit)
- Newsgroups: sci.math
- Subject: proof of quadratic reciprocity theorem
- Message-ID: <Btv6AA.7uC@watserv1.uwaterloo.ca>
- Date: 31 Aug 92 20:01:21 GMT
- Sender: news@watserv1.uwaterloo.ca
- Organization: University of Waterloo
- Lines: 21
-
- Jerry Tunnell once showed me the following neat proof of the
- quadratic reciprocity theorem. It goes as follows:
-
- Let p and q be distinct odd primes.
-
- (a) p is a square (mod q)
-
- (b) left multiplication by p gives an even permutation of Z/(q)
-
- (c) the discriminant of X^q - 1 is a square in Z/(p).
-
- (d) ((-1)^(q-1)/2) * q is a square (mod p).
-
- Then (a) <==> (b) <==> (c) <==> (d).
-
- Anybody know who this is originally due to? Anybody know where
- Tunnell is currently? I couldn't find his address in the
- CML.
-
- Jeff Shallit
- University of Waterloo
-