Discussiones Mathematicae - General Algebra and Applications 21(2) (2001)

1
A. Kartashova
Cardinalities of lattices of topologies of unars and some related topics
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129
2
H.J. Vogel
On the structure of halfdiagonal-halfterminal-symmetric categories with diagonal inversions
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139
3
I. Chajda, G. Eigenthaler
Some modifications of congruence permutability and dually congruence regular varietie
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165
4
K. Denecke, J. Koppitz, S.L. Wismath
The semantical hyperunification problem
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175
5
W. Guo, K.P. Shum
Minimal formations of universal algebras
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201
6
S.R. Park, S.Z. Song
Maximal column rank preservers of fuzzy matrices
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207
7
Sr. Arworn, K. Denecke
Tree transformations defined by hypersubstitutions
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219
8
I. Chajda, H. Langer
Congruence classes in Brouwerian semilattices
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229
9
D. Dorninger, H. Langer, M. Maczyński
Ring-like structures with unique symmetric difference related to quantum logic
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239
10
J. Płonka
The lattice of subvarieties of the biregularization of the variety of Boolean algebras
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255

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