FUNDAMENTALNAYA
I PRIKLADNAYA MATEMATIKA

(FUNDAMENTAL AND APPLIED MATHEMATICS)

2002, VOLUME 8, NUMBER 2, PAGES 631-635

V. Yu. Popov

Abstract

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```
Let
```$\mathcal P$
be a positive language,
$\mathcal L \subseteq \mathcal P$ ,
then
$\mathcal L\mathfrak X = \mathcal L\mathfrak X
\cap \mathfrak F$ ,
where $\mathfrak X$
is a nonperiodic semigroup variety and
$\mathfrak X \cap \mathfrak F$
is a finite trace of
the variety $\mathfrak X$ .

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Last modified: November 26, 2002