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math.GM2006
On the problem of M-hyperquasivarieties
Ewa Graczynska
The aim of the paper is to present a solution of the problem 32 posed by K. Denecke, S.L. Wismath in: {\it Hyperidentities and clones}, Logic and Applications Vol. 14, Gordon and B…
math.GM2005
Fluid varieties
Ewa Graczynska, Dietmar Schweigert
We invent the notion of a derived and fluid variety. Fluid variety has no proper derived variety as its subvariety. We examine some properties of fluid and derived varieties. Examp…