THE TEACHING OF MATHEMATICS

THE TEACHING OF MATHEMATICS
A universal sequence of continuous functions
Stevo Todorčević

Abstract

We show that for each positive integer $k$ there is a sequence $F_n:\Bbb{R}^k \rightarrow\Bbb{R}$ of {ıt continuous} functions which represents via point-wise limits {ıt arbitrary} functions $G\:X^k\rightarrow \Bbb{R}$ defined on domains $X\subseteq \Bbb{R}$ of sizes not exceeding a standard cardinal characteristic of the continuum.

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Keywords: Point-wise limit; continuum; continuous function.

Pages:  71$-$76     

Volume  XIV ,  Issue  2 ,  2011