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From: leiko on 16 Feb 2010 03:01
Let A=R[x,y]/(x^2+y^2-1). Let x' and y' be the images of x,y in A.
How can I show that the ideal (x',y'-1) is not principal in A.
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Prev: two most famous and important proofs in all of mathematics-- Pythagoras & AP-finite-selection #437 Correcting Math
Next: Marbles and jars - easier/closed form?