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  2. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    An equivalent definition is sometimes useful: if a and b are integers, then the fraction ⁠ a / b ⁠ is irreducible if and only if there is no other equal fraction ⁠ c / d ⁠ such that | c | < | a | or | d | < | b |, where | a | means the absolute value of a. [4] (Two fractions ⁠ a / b ⁠ and ⁠ c / d ⁠ are equal or equivalent if and ...

  3. Direct proof - Wikipedia

    en.wikipedia.org/wiki/Direct_proof

    The earliest form of mathematics was phenomenological. For example, if someone could draw a reasonable picture, or give a convincing description, then that met all the criteria for something to be described as a mathematical “fact”. On occasion, analogical arguments took place, or even by “invoking the gods”. The idea that mathematical ...

  4. Glossary of calculus - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_calculus

    In mathematics, the integral of a non-negative function of a single variable can be regarded, in the simplest case, as the area between the graph of that function and the x-axis. The Lebesgue integral extends the integral to a larger class of functions. It also extends the domains on which these functions can be defined. L'Hôpital's rule

  5. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    Following Gottlob Frege and Bertrand Russell, Hilbert sought to define mathematics logically using the method of formal systems, i.e., finitistic proofs from an agreed-upon set of axioms. [5] One of the main goals of Hilbert's program was a finitistic proof of the consistency of the axioms of arithmetic: that is his second problem.

  6. Simple function - Wikipedia

    en.wikipedia.org/wiki/Simple_function

    In the mathematical field of real analysis, a simple function is a real (or complex)-valued function over a subset of the real line, similar to a step function.Simple functions are sufficiently "nice" that using them makes mathematical reasoning, theory, and proof easier.

  7. List of undecidable problems - Wikipedia

    en.wikipedia.org/wiki/List_of_undecidable_problems

    Determining whether a λ-calculus formula has a normal form. Conway's Game of Life on whether, given an initial pattern and another pattern, the latter pattern can ever appear from the initial one. Rule 110 - most questions involving "can property X appear later" are undecidable.

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