Started, more than a century later, in Karl Weierstrass's works and later developed by
the contributions of mathematicians such as J. W. Alexander, P. I. Alexandrov and S. Lefschetz,
The topology, called (until 1930) "analysis site", is, as a branch of mathematics, the discipline that
it deals with the so-called topological properties of many points, ie those owners
who can formulate using only the notion of openness and the usual notions of the theory
multitudes, such as element, submultiple, complementary, meeting, intersection, and the like.
