Physical and Mathematical Sciences in the New Edition of Library Bibliographic Classification Schedules

The article presents changes in the structure and content of Schedules of Library Bibliographic Classification (LBC) to reflect the modern literature on Physical and Mathematical Sciences. The author describes specific features of separating the literature inside subdivision and between other divisions of the LBC Medium Schedules. The article considers the principles of separation of literature between Mathematics and Logic, representing the greatest difficulty in the systematization of literature. The range of issues belonging to the complex of computer sciences removed beyond the Division of Mathematics. Special sections on Hydro — and Aerodynamics collect literature, reflecting the applied directions in connection with a variety of technical applications, as well as separate research areas, where the studies are very intensive. The main series of subdivision on Physics is updated due to the introduction of new division, which reflects the new, rapidly developing areas of research in the Physics of soft condensed matter and Nanophysics. In this regard, there was conducted separation with the relevant subdivisions of Chemistry. Modern Radio physics turned from the applied science that supports Radio engineering in the extensive independent field of Physics. In this regard, it was decided to collect the literature on Radio physics in the Physics division, and to add the Radio band to the Schedule of special type sections on frequency ranges of electromagnetic waves. The new division of Laser Physics is introduced for the literature on physical processes related to the generation and amplification of optical radiation. The author describes the principles of separating with the subdivision on engineering technology, where lasers are considered as optical quantum generators. The Astronomy division for the first time presented the literature, reflecting studies on the detection of gravitational waves and on the origin and early evolution of the Solar system.