A definition of pictorial style in terms of distinctive combinations of pictorial devices characteristic of a particular culture or period or the work of an individual artist is proposed. Four kinds of pictorial structure are described: the drawing (spatial) systems, the denotation systems, the mark systems and the attributes systems. Three pictures by Poussin, Rembrandt and the Achilles painte...

On-line graph coloring algorithms have been defined in [2] as algorithms whose input graph is presented vertex by vertex, at each step the current vertex is given with all adjacencies to previously given vertices. The algorithm must color irrevocably the current vertex and has to maintain a proper vertex coloring. The simplest and best understood example of an on-line coloring algorithm is the ...

We consider the important generalisation of Ramsey numbers, namely on-line numbers. It is easiest to understand them by considering a game between two players, Builder and Painter, on an infinite set vertices. In each round, joins non-adjacent vertices with edge, Painter colors edge red or blue. An number r˜(G,H) minimum rounds it takes force create copy graph G blue H, assuming that both play ...