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  2. Onsager reciprocal relations - Wikipedia

    en.wikipedia.org/wiki/Onsager_reciprocal_relations

    The conservation of mass is expressed locally by the fact that the flow of mass density satisfies the continuity equation: + =, where is the mass flux vector. The formulation of energy conservation is generally not in the form of a continuity equation because it includes contributions both from the macroscopic mechanical energy of the fluid flow and of the microscopic internal energy.

  3. Quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics

    Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.

  4. Nervous system - Wikipedia

    en.wikipedia.org/wiki/Nervous_system

    Neuroscience is the field of science that focuses on the study of the nervous system. Structure The nervous system derives its name from nerves, which are cylindrical bundles of fibers (the axons of neurons ), that emanate from the brain and spinal cord , and branch repeatedly to innervate every part of the body. [ 5 ]

  5. Branches of science - Wikipedia

    en.wikipedia.org/wiki/Branches_of_science

    Applied science is the use of scientific processes and knowledge as the means to achieve a particularly practical or useful result. This includes a broad range of applied science-related fields, including engineering and medicine. Applied science can also apply formal science, such as statistics and probability theory, as in epidemiology.

  6. Knot theory - Wikipedia

    en.wikipedia.org/wiki/Knot_theory

    An example is 1*2 −3 2. The 1* denotes the only 1-vertex basic polyhedron. The 2 −3 2 is a sequence describing the continued fraction associated to a rational tangle. One inserts this tangle at the vertex of the basic polyhedron 1*. A more complicated example is 8*3.1.2 0.1.1.1.1.1 Here again 8* refers to a basic polyhedron with 8 vertices.

  7. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    the development of Mathematics provides a tightly connected network of formal rules, concepts, and systems. Nodes of this network are closely bound to procedures useful in human activities and to questions arising in science. The transition from activities to the formal Mathematical systems is guided by a variety of general insights and ideas.

  8. Riesz–Thorin theorem - Wikipedia

    en.wikipedia.org/wiki/Riesz–Thorin_theorem

    For example, the Riemann–Lebesgue lemma shows that the Fourier transform maps L 1 (R d) boundedly into L ∞ (R d), and Plancherel's theorem shows that the Fourier transform maps L 2 (R d) boundedly into itself, hence the Fourier transform extends to (L 1 + L 2) (R d) by setting (+) = + for all f 1 ∈ L 1 (R d) and f 2 ∈ L 2 (R d).

  9. Scientific method - Wikipedia

    en.wikipedia.org/wiki/Scientific_method

    The history of the scientific method considers changes in the methodology of scientific inquiry, not the history of science itself. The development of rules for scientific reasoning has not been straightforward; the scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the ...