Theory (disambiguation)
Encyclopedia
Theory
Theory
The English word theory was derived from a technical term in Ancient Greek philosophy. The word theoria, , meant "a looking at, viewing, beholding", and referring to contemplation or speculation, as opposed to action...

is speculative explanation, as opposed to practice or "just doing".
Theory may also refer to:
  • Theory (mathematics), a self-consistent body of definitions, axioms, theorems, examples, and so on
  • Theory (mathematical logic)
    Theory (mathematical logic)
    In mathematical logic, a theory is a set of sentences in a formal language. Usually a deductive system is understood from context. An element \phi\in T of a theory T is then called an axiom of the theory, and any sentence that follows from the axioms is called a theorem of the theory. Every axiom...

    , a set of sentences (theorems) in a formal language
  • Scientific theory
    Scientific theory
    A scientific theory comprises a collection of concepts, including abstractions of observable phenomena expressed as quantifiable properties, together with rules that express relationships between observations of such concepts...

    , a principle or body of principles for explaining a class of phenomena
  • Philosophical theory
    Philosophical theory
    In the general sense, a philosophical theory is a theory that explains or accounts for a general philosophy or specific branch of philosophy. While any sort of thesis or opinion may be termed a theory, in analytic philosophy it is thought best to reserve the word "theory" for systematic,...

    , the collective statements underlying a philosophy, school of thought, or belief system
  • Theoria
    Theoria
    For other uses of the term "contemplation", see Contemplation Theoria is Greek for contemplation. It corresponds to the Latin word contemplatio, "looking at", "gazing at", "being aware of".- Introduction :...

     in theological discussions
  • Computational complexity theory
    Computational complexity theory
    Computational complexity theory is a branch of the theory of computation in theoretical computer science and mathematics that focuses on classifying computational problems according to their inherent difficulty, and relating those classes to each other...

     in computer science
  • Theory (clothing retailer)
  • A type of argument in Policy debate
    Policy debate
    Policy debate is a form of speech competition in which teams of two advocate for and against a resolution that typically calls for policy change by the United States federal government or security discourse...

     and Lincoln-Douglas debate
    Lincoln-Douglas debate
    Lincoln–Douglas debate is sometimes also called values debate because it traditionally places a heavy emphasis on logic, ethical values, and philosophy...

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