Re: quadratic residues confusion

David C. Ullrich a écrit :
On 23 Apr 2006 01:40:14 -0700, "perltcl@xxxxxxxxx" <perltcl@xxxxxxxxx>
wrote:

hi

I read in this group, quadratic residues are fully multiplicative,

That doesn't make much sense - you mean that you read that Legendre
symbols are completely nultiplicative.

see
http://groups.google.com/group/comp.soft-sys.math.maple/browse_thread/thread/5a47330e108d158b/13bfa08d3f0a2130?lnk=st&q=Legendre+symbol++are+multiplicative&rnum=4&hl=en#13bfa08d3f0a2130

but since Legendre symbols have values {1,-1}
does that mean if I have (-1)*(-1)=1 ==>> two non-residues multipled
together to get a residue?
strange

Why is it strange for the product of two non-squares to be a square?
Think about the integers. Is 2 a square? How about 2 times 2?



Or even stranger : how about 2 times 18

************************

David C. Ullrich
.

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