3. 744 ; the method employed is of course that of Polya and de Bruijn. Recently the author was asked by a poet to illustrate a long poem of 66 stanzas, each of 6 lines. It had already been agreed that the Al illustrations Ar would be drawn from the repertoire of mathematical configurations a either Al trees Ar or Al animals Ar. But how to find a finite set of 66 graphs made up of 6 lines ? Polya  exhibited theanbsp;...
|Title||:||Problèmes combinatoires et théorie des graphes|