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  2. List of valid argument forms - Wikipedia

    en.wikipedia.org/wiki/List_of_valid_argument_forms

    Another form of argument is known as modus tollens (commonly abbreviated MT). In this form, you start with the same first premise as with modus ponens. However, the second part of the premise is denied, leading to the conclusion that the first part of the premise should be denied as well.

  3. René Descartes - Wikipedia

    en.wikipedia.org/wiki/René_Descartes

    One of Descartes's most enduring legacies was his development of Cartesian or analytic geometry, which uses algebra to describe geometry; the Cartesian coordinate system is named after him. He was first to assign a fundamental place for algebra in the system of knowledge, using it as a method to automate or mechanize reasoning, particularly ...

  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. Logical reasoning - Wikipedia

    en.wikipedia.org/wiki/Logical_reasoning

    The types of logical reasoning differ concerning the exact norms they use as well as the certainty of the conclusion they arrive at. [1] [15] Deductive reasoning offers the strongest support and implies its conclusion with certainty, like mathematical proofs. For non-deductive reasoning, the premises make the conclusion more likely but do not ...

  6. Proportional reasoning - Wikipedia

    en.wikipedia.org/wiki/Proportional_reasoning

    In Piaget's model of intellectual development, the fourth and final stage is the formal operational stage.In the classic book "The Growth of Logical Thinking from Childhood to Adolescence" by Jean Piaget and Bärbel Inhelder formal operational reasoning takes many forms, including propositional reasoning, deductive logic, separation and control of variables, combinatorial reasoning, and ...

  7. Geometric logic - Wikipedia

    en.wikipedia.org/wiki/Geometric_logic

    A theory of first-order logic is geometric if it is can be axiomatised using only axioms of the form ,,,, where I and J are disjoint collections of formulae indices that each may be infinite and the formulae φ are either atoms or negations of atoms.