ENDM
2002
14 years 11 days ago
2002
Let k be an integer and M be a closed 2-manifold with Euler characteristic (M) 0. We prove that each polyhedral map G on M with minimum degree and large number of vertices conta...
BSL
2000
14 years 12 days ago
2000
We recall the notions of weak and strong Euler characteristics on a first order structure and make explicit the notion of a Grothendieck ring of a structure. We define partially or...
COMBINATORICS
2006
14 years 19 days ago
2006
Let Sm,n be the graph on the vertex set Zm