*** Let R be a unique factorization domain. Let p E R. If x is irreducible, then it is prime.***
*** Let R be a unique factorization domain. Let p E R. If x is irreducible, then it is prime.***
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:änd read well.
Consider the proof of the theorem below. Justify each step that makes a claim, no matter how
trivial. It is available in a Word document for your convenience.
***Let R be a unique factorization domain. Let p E R. If x is irreducible, then it is prime.***
Assume x is irreducible.
Assume x|ab for some a, b eR.
* a = Pip2 " Pn for somen E N and p'SER where each p is irreducible.
* b = q,92 * 4m for somem E N and q,'S ER where each g, is irreducible.
%3D
XC =
ab for some c € R.
* XC = P1P2 ** Pn9192 *** ¶m
*x is an associate with either some p, or some q, (Maybe both!)
Wlog x is an associate with p..
*x = P,u for some u E R*.
* xu= P1
= (xu )P2P3 Pn
* a = x(u-'paP3" Pn)
* x|a
*x is prime.
a =
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