
doi: 10.1007/bf03322244
handle: 10807/129204 , 11379/6446
Let \((P,{\mathcal L})\) be an incidence space. Following a definition of \textit{B. Reinmiedl} [`Verallgemeinerte kinematische Räume', Diss. TU München (1990; Zbl 0721.51018)] the authors call a map \(\delta:P\to P\) a dilatation if \(\delta(L)\cap L=\emptyset\) or \(\delta(L)=L\) for any \(L\in{\mathfrak G}\) and \((P,{\mathfrak L},\cdot)\) a dilatation space if \(P\) is supplied with a binary operation such that \(x\to ax\), \(x\to xa\) are dilatations for any \(a\overline\in P\). For the nontrivial cases \(|{\mathfrak L}|\geq 2\), \(|L|\geq 3\) for each \(L\overline\in{\mathfrak L}\) they can show: \((P,\cdot)\) is a quasigroup, in particular a kinematic loop if it has an identity, the set \(P_{id}\) of idempotents of \((P,\cdot)\) is empty, \(=P\) or is of cardinality 1, if \(P_{id}=\varphi\) then \((P,{\mathcal F},\cdot)\) is a fibered quasigroup with fibration \({\mathcal F}=\{F\overline\in{\mathcal L};F\cdot F\subset F\}\), if \(P_{id}\neq\emptyset\) then \((P,{\mathcal L},\cdot)\) is a kinematic quasigroup. Furthermore, conditions and relevant examples are given to verify whether a dilatation space embedded into a projective space is a kinematic space in the sense of H. Karzel.
Kinematic spaces, Loops, quasigroups, Incidence structures embeddable into projective geometries, dilatation space, projective embedding, kinematic space, linear space with parallelism, dilatation, incidence quasigroup
Kinematic spaces, Loops, quasigroups, Incidence structures embeddable into projective geometries, dilatation space, projective embedding, kinematic space, linear space with parallelism, dilatation, incidence quasigroup
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