Prove that C[x, y]/ is an integral domain

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Prove that C[x, y]/<xn + yn − 1> is an integral domain.

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Step 1
  • Gauss's lemma: A non-constant polynomial in x is irreducible in x if and only if it is both irreducible in x and primitive in x.

 

  • Eisenstein criterion: Suppose that fxx is given by

                                       fx=cnxn+...+c1x+c0

(1) p does not divide cn

(2) p divides cn-1, ..., p1, p0

(3) p2 does not divide c0

Then, fx is irreducible in x

 

  • Cx, yxn+yn-1 is an integral domain if and only if xn+yn-1  is prime in Cx, y if and only if xn+yn-1 is irreducible in Cx, y
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