As results of Roberval's labours outside the department of pure mathematics may be noted a work on the system of the universe, in which he supports the Copernican system and attributes a mutual attraction to all particles of matter; and also the invention of a special kind of balance which goes by his name.
For pure mathematics he had a special gift - almost a passion.
In pure mathematics the hypotheses which a set of entities are to satisfy are given, and a group of interesting deductions are sought.
Section A deals with pure mathematics.
This survey of the existing developments of pure mathematics confirms the conclusions arrived at from the previous survey of the theoretical principles of the subject.