most citedOn the problem of basis for hyperquasivarieties

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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…

math.GM2004

M-hyperquasivarieties

E. Graczynska, D. Schweigert

We generalize the notion of hyperquasivariety and hyperquasiidentity to the notion of M-hyperquasivariety and M-hyperquasiidentity. Birkhoff's and Malcev's type theorems are presen…