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  2. Theory - Wikipedia

    en.wikipedia.org/wiki/Theory

    The English word theory derives from a technical term in philosophy in Ancient Greek.As an everyday word, theoria, θεωρία, meant "looking at, viewing, beholding", but in more technical contexts it came to refer to contemplative or speculative understandings of natural things, such as those of natural philosophers, as opposed to more practical ways of knowing things, like that of skilled ...

  3. Scientific theory - Wikipedia

    en.wikipedia.org/wiki/Scientific_theory

    For example, atomic theory is an approximation of quantum mechanics. Current theories describe three separate fundamental phenomena of which all other theories are approximations; [28] the potential unification of these is sometimes called the Theory of Everything. [7]

  4. Theory-theory - Wikipedia

    en.wikipedia.org/wiki/Theory-theory

    The theory-theory (or ' theory theory ') is a scientific theory relating to the human development of understanding about the outside world. [1] This theory asserts that individuals hold a basic or 'naïve' theory of psychology (" folk psychology ") to infer the mental states of others, [ 1 ] such as their beliefs, desires or emotions.

  5. List of mathematical theories - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_theories

    Almgren–Pitts min-max theory; Approximation theory; Arakelov theory; Asymptotic theory; Automata theory; Bass–Serre theory; Bifurcation theory; Braid theory; Brill–Noether theory; Catastrophe theory; Category theory; Chaos theory; Character theory; Choquet theory; Class field theory; Cobordism theory; Coding theory; Cohomology theory ...

  6. Decision theory - Wikipedia

    en.wikipedia.org/wiki/Decision_theory

    The mythological Judgement of Paris required selecting from three incomparable alternatives (the goddesses shown).. Decision theory or the theory of rational choice is a branch of probability, economics, and analytic philosophy that uses the tools of expected utility and probability to model how individuals would behave rationally under uncertainty.

  7. Theoretical physics - Wikipedia

    en.wikipedia.org/wiki/Theoretical_physics

    For example, an essentially correct theory may need some conceptual or factual revisions; atomic theory, first postulated millennia ago (by several thinkers in Greece and India) and the two-fluid theory of electricity [9] are two cases in this point.

  8. Theory (mathematical logic) - Wikipedia

    en.wikipedia.org/wiki/Theory_(mathematical_logic)

    In mathematical logic, a theory (also called a formal theory) is a set of sentences in a formal language. In most scenarios a deductive system is first understood from context, after which an element ϕ ∈ T {\displaystyle \phi \in T} of a deductively closed theory T {\displaystyle T} is then called a theorem of the theory.

  9. Philosophical theory - Wikipedia

    en.wikipedia.org/wiki/Philosophical_theory

    A philosophical theory or philosophical position [1] is a view that attempts to explain or account for a particular problem in philosophy. [ citation needed ] The use of the term "theory" is a statement of colloquial English and not a technical term. [ 2 ]