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November 14th, 2007, 06:14 AM   #1
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ring

Take the ring R=Z/4Z. Find a polynomial of degree 1 in R[X] such that its square is the constant 1.
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November 14th, 2007, 10:50 AM   #2
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easy!

use the "4=0" force
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November 27th, 2007, 12:42 PM   #3
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How do you do that?
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December 7th, 2007, 07:47 AM   #4
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What is the square of 1 + 2*a in R ?
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