Conjectural search queries (is python case sensitive, is millennium stadium heated) embody attempts by Web users to verify whether a particular property (soluble in water?, case sensitive?, heated?) does or does not apply to a particular instance (iodine, python, millennium stadium). This paper considers such queries to be a data source of attributes of open-domain classes. Conjectural attribut...

It is shown that square free set theoretic involutive non-degenerate solutions of the Yang-Baxter equation whose associated permutation group (referred to as an involutive Yang-Baxter group) is abelian are retractable in the sense of Etingof, Schedler and Soloviev. This solves a problem of Gateva-Ivanova in the case of abelian IYB groups. It also implies that the corresponding finitely presente...

Ottoia prolifica Walcott, 1911 is a 500 million years old fossil cycloneuralian worm from the Burgess Shale, Canada, British Columbia. We report newly observed details of the morphology and ontogeny of this species. Previously unknown details could be observed by applying crossedpolarized light. This approach revealed that the tail end is equipped with six hook-shaped spines and that the scalid...

A 16-year-old male patient was admitted to our hospital with traumatic luxation of right testis due to self-mutilation with a retractable knife on Apr. 20, 2004. He had been followed as temporal lobe epilepsy and suspicions of gender identify disorder by a pediatrician. He was fully oriented with a clear sensory and normal perception, but had no memory of what he had done. His parents were free...

An R-module is called semi-endosimple if it has no proper fully invariant essential submodules. For a quasi-projective retractable module MR we show that M is finitely generated semi-endosimple if and only if the endomorphism ring of M is a finite direct sum of simple rings. For an arbitrary module M , conditions equivalent to the semi-endosimplicity of its quasi-injective hull are found. As co...