Answer to Question #12541 in Algebra for Hym@n B@ss
As it is PID we have b in K that I=<b>.
X belongs to
I then X=(dX)b. Then db=1. Hence b=d^(-1) => I=<b>=K[X].
u(X)X+v(X)a. => 1=v(0)a => a - invertible => K is
Reverse implication is obvious.
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