The removal of from some undecidable problems involving elementary functions
The removal of from some undecidable problems involving elementary functions
复制标题
消除一些涉及初等函数的不可判定问题
DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
M. Laczkovich
中科院分区:
文献类型:
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作者:
M. Laczkovich
We show that in the ring generated by the integers and the functions x; sin x(n) and sin(x . sin x(n)) (n = 1, 2,...) defined on R it is undecidable whether or not a function has a positive value or has a root. We also prove that the existential theory of the exponential field C is undecidable.