Space structures, their theory, and applications. 3

The paper is the third part of the book “Space structures, their theory and applications”. This part consists of introduction and two chapters: $P^2$-topological spaces and structuralized sets. The second chapter consists of introduction and five paragraphs: $P$-bitopological structures, $P$-pairwise topological structures, $P^2$-bitopological structures, $P^2$-pairwise topological structures and $P^3$-topological structures.