Cardinality of retracts of monounary algebras

被引：3

作者：

Jakubikova-Studenovska, Danica ^{[1
]}

Pocs, Jozef ^{[2
]}

机构：

[1] Safarik Univ, Inst Math, Kosice 04154, Slovakia

[2] Slovak Acad Sci, Math Inst, Kosice 04001, Slovakia

来源：

CZECHOSLOVAK MATHEMATICAL JOURNAL | 2008年 / 58卷 / 02期

关键词：

monounary algebra; retract; cardinality;

D O I：

10.1007/s10587-008-0028-5

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

For an uncountable monounary algebra (A, f) with cardinality kappa it is proved that (A, f) has exactly 2(kappa) retracts. The case when (A, f) is countable is also dealt with.

引用

页码：469 / 479

页数：11

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