Subdirectly irreducible sloops and SQS-skeins
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ARMANIOUS, Magdi, ELZAYAT, Enas-M.. Subdirectly irreducible sloops and SQS-skeins . In: Quasigroups and Related Systems, 2007, vol. 15, nr. 2(18), pp. 233-250. ISSN 1561-2848.
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Quasigroups and Related Systems
Volumul 15, Numărul 2(18) / 2007 / ISSN 1561-2848

Subdirectly irreducible sloops and SQS-skeins

Pag. 233-250

Armanious Magdi, Elzayat Enas-M.
 
 
 
Disponibil în IBN: 16 decembrie 2013


Rezumat

It was shown in [2] that there is 8 classes of nonsimple subdirectly irre- ducible SQS-skeins of cardinality 32 (SK(32)s). Now, we present the same classication for sloops of cardinality 32 (SL(32)s) and unify this classi- cation for both SL(32)s and SK(32)s in one table. Next, some recur- sive construction theorems for subdirectly irreducible SL(2n)s and SK(2n)s which are not necessary to be nilpotent are given. Further, we construct an SK(2n) with a derived SL(2n) such that SK(2n) and SL(2n) are subdi- rectly irreducible and have the same congruence lattice. We also construct an SK(2n) with a derived SL(2n) such that the congruence lattice of SK(2n) is a proper sublattice of the congruence lattice of SL(2n).

Cuvinte-cheie
Steiner triple system, Steiner loops, Steiner quadruple system, SQS-skein

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<dc:creator>Armanious, M.H.</dc:creator>
<dc:creator>Elzayat, E.A.</dc:creator>
<dc:date>2007-06-04</dc:date>
<dc:description xml:lang='en'>It was shown in [2] that there is 8 classes of nonsimple subdirectly irre-
ducible SQS-skeins of cardinality 32 (SK(32)s). Now, we present the same
classication for sloops of cardinality 32 (SL(32)s) and unify this classi-
cation for both SL(32)s and SK(32)s in one table. Next, some recur-
sive construction theorems for subdirectly irreducible SL(2n)s and SK(2n)s
which are not necessary to be nilpotent are given. Further, we construct
an SK(2n) with a derived SL(2n) such that SK(2n) and SL(2n) are subdi-
rectly irreducible and have the same congruence lattice. We also construct
an SK(2n) with a derived SL(2n) such that the congruence lattice of SK(2n)
is a proper sublattice of the congruence lattice of SL(2n).
</dc:description>
<dc:source>Quasigroups and Related Systems 18 (2) 233-250</dc:source>
<dc:subject>Steiner triple system</dc:subject>
<dc:subject>Steiner loops</dc:subject>
<dc:subject>Steiner quadruple system</dc:subject>
<dc:subject>SQS-skein</dc:subject>
<dc:title>Subdirectly irreducible sloops and SQS-skeins
</dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>