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arXiv 2610.12964math.LO
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构造性反数学中极小原理的强度

The strength of the minimum principle in constructive reverse mathematics

Kochi University(高知大学)

Tatsuji Kawai

AI总结:

本文在构造性反数学基础系统EL0中,证明极小原理等价于弱柯尼希引理、康托尔交集定理,完善了相关原理间的等价关系。

摘要:

极小原理指出,对紧度量空间X上的任意实值一致连续函数f: X→ℝ,f必能达到其极小值。在构造性反数学的基础系统EL0中,本文证明极小原理等价于弱柯尼希引理及康托尔交集定理(即海涅-博雷尔定理的逆否命题)。此外,上述等价关系可自然推广至带唯一存在假设的对应原理的等价性,进而证明这些带唯一存在假设的原理等价于可分条的扇定理,以及紧空间上实值一致连续函数的正性性质。这些结果完善了Ishihara(《数学逻辑季刊》1990年,第237-240页)与Berger和Ishihara(《数学逻辑季刊》2005年,第360-364页)在毕晓普构造性数学中得到的这些原理间的等价关系。

英文摘要:

The minimum principle states that every real-valued uniformly continuous function f : X -> R on a compact metric space X attains its minimum. Working in the base system EL0 of constructive reverse mathematics, we show that the minimum principle is equivalent to weak Konig's lemma and to the Cantor intersection theorem (i.e., the contrapositive of the Heine-Borel theorem). Moreover, the above equivalence naturally extends to the equivalence between the corresponding principles with unique existence assumptions, which are then shown to be equivalent to the Fan theorem for detachable bars and the positivity property for a real-valued uniformly continuous function on a compact space. These results sharpen the equivalence among these principles obtained by Ishihara [Math. Log. Q. (1990), 237-240] and Berger and Ishihara [Math. Log. Q. (2005), 360-364] in Bishop's constructive mathematics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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