Ce bulletin s’adresse aux ingenieurs en structures, aux architectes ainsi qu’aux mathematiciens qui pourraient s’interesser aux problemes fondamentaux de I’espace a trois dimensions et de son utilisation en architecture. ...

This article summarizes the presently available general theory of rigidity of 3-dimensional structures. We explain how a structure, for instance a bar and joint structure, can fail to be rigid for two quite different types ...

We address ourselves to three types of combinatorial and projective problems, all of which concern the patterns of faces, edges and vertices of polyhedra. These patterns, as combinatorial structures, we call combinatorial ...