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5. Closure functions on the set of positive integers

Closure functions on the set of positive integers

来源 :中国科学：数学英文版 | 被引量 : 0次 | 上传用户：zilianyy

【摘 要】

：

The following question raised by P. C. Hammer in 1960 is answered: Let M be the set of all positive integers, ft the closure function under multiplication defin

【作 者】

：

岑嘉评 

【机 构】

：

DepartmentofMathematics,TheChineseUniversityofHongKong,HongKong

【出 处】

：

中国科学：数学英文版

【发表日期】

：

1996年4期

【关键词】

：

ALGEBRAIC CLOSURE FUNCTION ALGEBRAIC BOUNDARY K-sets. algebraic closure function 

【基金项目】

：

This research s partially supported by UGC(UK)grant No.221600370.

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论文部分内容阅读

The following question raised by P. C. Hammer in 1960 is answered: Let M be the set of all positive integers, ft the closure function under multiplication defined on the power set of M and c the complementation function. Do h and c generate exactly 14 dis

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