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Odd order semidirect extensions of commutative automorphic loops

Přemysl Jedlička (2014)

Commentationes Mathematicae Universitatis Carolinae

We analyze semidirect extensions of middle nuclei of commutative automorphic loops. We find a less complicated conditions for the semidirect construction when the middle nucleus is an odd order abelian group. We then use the description to study extensions of orders 3 and 5 .

On a class of commutative groupoids determined by their associativity triples

Aleš Drápal (1993)

Commentationes Mathematicae Universitatis Carolinae

Let G = G ( · ) be a commutative groupoid such that { ( a , b , c ) G 3 ; a · b c a b · c } = { ( a , b , c ) G 3 ; a = b c or a b = c } . Then G is determined uniquely up to isomorphism and if it is finite, then card ( G ) = 2 i for an integer i 0 .

On abelian inner mapping groups of finite loops

Markku Niemenmaa (2000)

Commentationes Mathematicae Universitatis Carolinae

In this paper we consider finite loops of specific order and we show that certain abelian groups are not isomorphic to inner mapping groups of these loops. By using our results we are able to construct a finite solvable group of order 120 which is not isomorphic to the multiplication group of a finite loop.

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