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  2. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    Philosophy portal; Glossary of logic; Józef Maria BocheÅ„ski; List of notation used in Principia Mathematica; List of mathematical symbols; Logic alphabet, a suggested set of logical symbols; Logic gate § Symbols; Logical connective; Mathematical operators and symbols in Unicode; Non-logical symbol; Polish notation; Truth function; Truth table

  3. Philosophical logic - Wikipedia

    en.wikipedia.org/wiki/Philosophical_logic

    Extended logics are logical systems that are based on classical logic and its rules of inference but extend it to new fields by introducing new logical symbols and the corresponding rules of inference governing these symbols. In the case of alethic modal logic, these new symbols are used to express not just what is true simpliciter, but also ...

  4. Outline of logic - Wikipedia

    en.wikipedia.org/wiki/Outline_of_logic

    Logic is the formal science of using reason and is considered a branch of both philosophy and mathematics and to a lesser extent computer science. Logic investigates and classifies the structure of statements and arguments, both through the study of formal systems of inference and the study of arguments in natural language .

  5. Philosophy of logic - Wikipedia

    en.wikipedia.org/wiki/Philosophy_of_logic

    Philosophy of logic is the area of philosophy that studies the nature of logic. [1] [2] Like many other disciplines, logic involves various philosophical presuppositions which are addressed by the philosophy of logic. [3]

  6. Glossary of logic - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_logic

    A symbol or function in logic that applies to one or more propositions, producing another proposition that expresses a logical operation such as negation, conjunction, or disjunction. logical paradox A statement or group of statements that lead to a contradiction or a situation that defies intuition, often highlighting limitations or problems ...

  7. If and only if - Wikipedia

    en.wikipedia.org/wiki/If_and_only_if

    The corresponding logical symbols are "", "", [6] and , [10] and sometimes "iff".These are usually treated as equivalent. However, some texts of mathematical logic (particularly those on first-order logic, rather than propositional logic) make a distinction between these, in which the first, ↔, is used as a symbol in logic formulas, while ⇔ is used in reasoning about those logic formulas ...

  8. Logic - Wikipedia

    en.wikipedia.org/wiki/Logic

    Formal logic (also known as symbolic logic) is widely used in mathematical logic. It uses a formal approach to study reasoning: it replaces concrete expressions with abstract symbols to examine the logical form of arguments independent of their concrete content. In this sense, it is topic-neutral since it is only concerned with the abstract ...

  9. Logical constant - Wikipedia

    en.wikipedia.org/wiki/Logical_constant

    The equality predicate (usually written '=') is also treated as a logical constant in many systems of logic. One of the fundamental questions in the philosophy of logic is "What is a logical constant?"; [1] that is, what special feature of certain constants makes them logical in nature? [2] Some symbols that are commonly treated as logical ...