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The property of having independent basis in semigroup varieties
Authors:V. Yu. Popov
Abstract:There exist independently based semigroup varieties 
$$mathfrak{X}$$
and 
$$mathfrak{Y}$$
, 
$$mathfrak{X}$$

$$subset$$

$$mathfrak{Y}$$
, such that 
$$mathfrak{X}$$
has no cover in the interval [
$$mathfrak{X}$$
; 
$$mathfrak{Y}$$
].Translated from Algebra i Logika, Vol. 44, No. 1, pp. 81–96, January–February, 2005.
Keywords:semigroup variety  independently based variety
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