**Section 5: Mathematics, Natural sciences: Astronomy, Astrophysics, Geodesy, Physics, Chemistry, Geology and related sciences, Paleontology, Biological sciences**

5 - Mathematics and natural sciences.

50 - Environmental science.

502 - Environmental science. Environment protection.

502.1 - Environment and society. Eco development. Sustainable development

502.5 -Nature reserves. Scenic parks. Landscape protection.

504 - Threats to the environment.

51 - Mathematics.

51(09) - Mathematics – history.

51-7 - Research and mathematical methods in other fields of science.

51-7:336 - Financial mathematics.

510.22 - Set theory.

510.6 - Mathematical logic.

511 - Number theory.

512 - Algebra.

512.6/.8 - Special divisions of algebra. Polynomials. Algebraic equations. Algebraic geometry. Lie groups.

514 - Geometry.

515.1 - Topology.

517 – Mathematical analysis.

517.2/.4 - Differential calculus. Integral calculus.

517.5 - Real-valued functions. Functions of a complex variable.

517.9 - Differential, integral, functional, difference equations.

517.98 - Functional analysis. Theory of operators.

519.1 - Combinatorial analysis. Graph theory.

519.2 - Calculus of probability. Mathematical statistics. Statistical analysis.

519.6 - Computational mathematics. Numerical analysis.

519.7 - Mathematical cybernetics. Theory of information (mathematical aspect).

519.8 - Operational research. Game theory. Mathematical programming. Mathematical models.

52 - Astronomy. Geodesy. Surveying. Cartography.

520/524 - Astronomy. Astrophysics.

528 - Geodesy. Surveying. Photogrammetry. Cartography.

53 - Physics.

530.1 - Basic principles of physics. Theory of relativity.

530.145 - Quantum theory. Quantum physics. Quantum mechanics.

531/534 - Mechanics.

535 - Light. Optics.

536 - Heat. Thermodynamics.

537 - Electricity. Magnetism. Electromagnetism.

538.9 - Condensed matter physics (liquid state and solid state).

539 - Physical nature of matter. Nuclear, atomic and molecular physics.

54 - Chemistry.

543 - Analytical chemistry.

543.2/.5 - Methods of analysis: chemical, spectral, optical and physico-chemical. Spectroscopy. Chromatography.

544 - Physical and theoretical chemistry.

546 - Inorganic chemistry.

547 - Organic chemistry.

548/549 - Crystallography. Mineralogy.

55 - Geology and related sciences. Meteorology. Hydrology.

550 - Ancillary sciences of geology. Geophysics. Geochemistry. Geobiology.

551 - General geology: physical geology and geodynamics. Meteorology. Historical geology. Stratigraphy. Paleogeography.

552/553 - Petrography. Rocks. Economic geology. Science of mineral deposits.

556 - Hydrology. Hydrosphere.

56 - Palaeontology. Fossilology.

57 - Biological sciences.

572 - Anthropology.

573 - General and theoretical biology.

574 - General ecology. Biocoenology. Hydrobiology. Biogeography.

575 - General genetics. General cytogenetics. Immunogenetics. Evolution. Phylogeny.

576 - Cellular biology. Cytology.

577 - Material bases of life. Biochemistry. Molecular biology. Biophysics.

578/579 - Virology. Microbiology.

58 - Botany.

581 - General botany. Biology of plants.

581.1/.4 - Plant physiology. Plant diseases. Phytopatology. Embryology of plants. Ontogenesis. Plant morphology. Plant histology. Tissues.

581.5 - Plant ecology. Ethology of plants.

581.9 - Plant geography. Floras.

582 - Systematic botany.

582(083.44) - Plant identification keys.

59 - Zoology.

591 - General zoology. Biology of animals.

591.1 - Animal physiology.

591.3 - Animal embryology. Ontogeny.

591.4 - Animal anatomy. Organology. Zootomy.

591.5 - Animal habits. Ecology of animals. Ethology of animals.

591.8 - Animal histology.

591.9 - Geographic zoology. Fauna.

592/599 - Systematic zoology.

593/595 - Invertebrates.

595.7 - Insects. Entomology.

595.7(083.44) - Insects identifcation keys.

596/599 - Vertebrates. Chordata.

597/598.1 - Fishes. Amphibia. Reptiles.

598.2 - Birds. Ornithology.

599 - Mammals.