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  1. en.wikipedia.org › wiki › TheoryTheory - Wikipedia

    A theory is a rational type of abstract thinking about a phenomenon, or the results of such thinking. The process of contemplative and rational thinking is often associated with such processes as observational study or research. Theories may be scientific, belong to a non-scientific discipline, or no discipline at all.

    • Critical theory

      A critical theory is any approach to humanities and social...

    • Number theory

      Number theory (or arithmetic or higher arithmetic in older...

  2. A scientific theory is an explanation of an aspect of the natural world and universe that can be (or a fortiori, that has been) repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.

  3. Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experimental tools to probe these phenomena.

  4. en.wikipedia.org › wiki › Game_theoryGame theory - Wikipedia

    Game theory is the study of mathematical models of strategic interactions among rational agents. It has applications in many fields of social science, used extensively in economics as well as in logic, systems science and computer science.

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