The D-resultant, singularities and the degree of unfaithfulness

The D-resultant, singularities and the degree of unfaithfulness
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DOI:
10.1090/s0002-9939-97-03639-3
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发表时间:
1997
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通讯作者:
Jie-Tai Yu
Jie-Tai Yu
中科院分区:
其他
文献类型:
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作者:
Jie-Tai Yu

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我们引入了两个一元多项式的D-结式,并说明了如何利用它来判定k(f(T),g(T))=k(T),k[f(T),g(T)]=k[t],以及求曲线x=f(T),y=g(T)的奇点。第二个判据被用来给出Abhyankar和MoH的满态定理的一个特例的一个非常简短的证明。
We introduce the D-resultant of two polynomials in one variable and show how it can be used to decide if k(f(t), g(t)) = k(t), k[f(t), g(t)] = k[t] and to find the singularities of the curve x = f(t), y = g(t). The second criterion is used to give a very short proof of a special case of the epimorphism theorem of Abhyankar and Moh.