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UTM Ideals Varieties and Algorithm - Chapter 1 Section 5 Exercise 5
Problem:
Solution
If
p∈⟨f−qg,g⟩, then
p=a(f−qg)+bg=af+(b−aq)g∈⟨f,g⟩
If
p∈⟨f,g⟩, then
p=af+bg=a(f−qg)+(b+aq)g∈⟨f−qg,g⟩
Therefore
⟨f−qg,g⟩=⟨f,g⟩.
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