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kvissuet
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Homework Statement
Define the set of units in R[x] where R is a commutative Ring and R[x] the polynomial ring.
Homework Equations
Unit: X is a unit in R if there exist a Y in R such that XY=1
The Attempt at a Solution
At first I thought it was this:
R[x]* = {u +a1x + a2x^2...anx^n : u2=1 and ak2 = 0 }
But I feel that this is just a subset of the actual set of units.
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