As if following the natural course of an ingested particle, several structures in the gastrointestinal tract which were named after their discoverers are presented including concise backgrounds of these pioneers of the human intestines.

The notion of an excellent quadratic form has been introduced by M. Knebusch 10, 11]. It has an obvious analogue for a semisimple linear algebraic group G over an arbitrary eld k: the group G is excellent if, for any eld extension K of k, the anisotropic kernel of the K-group G k K can be deened by a k-group. The aim of this paper is to investigate excellence properties of special linear and or...

LetG = (V,E) be a simple graph. Let u ∈ V (G). u is said to be β0 good if u is contained in a β0-set of G. u is said to beβ0-bad if there exists noβ0-set of G containing u. A graph G is said to be β0excellent if every vertex of G is β0-good. In this paper, many results on β0 excellent are obtained. And some relation between some other parameters are also investigated. Mathematics Subject Classi...

Abstract A graph G is $$\alpha $$ α -excellent if every vertex of contained in some maximum independent set . In this paper, we characterize bipartite graphs, unicyclic simplicial chordal block and show that generalized Petersen -excellent.