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  2. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  3. Irrational rotation - Wikipedia

    en.wikipedia.org/wiki/Irrational_rotation

    Irrational rotations form a fundamental example in the theory of dynamical systems. According to the Denjoy theorem, every orientation-preserving C 2-diffeomorphism of the circle with an irrational rotation number θ is topologically conjugate to T θ. An irrational rotation is a measure-preserving ergodic transformation, but it is not mixing.

  4. Square root of 2 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_2

    Since we have derived a falsehood, the assumption (1) that is a rational number must be false. This means that is not a rational number; that is to say, is irrational. This proof was hinted at by Aristotle, in his Analytica Priora, §I.23. [12]

  5. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    Hence, the set of real numbers consists of non-overlapping sets of rational, algebraic irrational, and transcendental real numbers. [3] For example, the square root of 2 is an irrational number, but it is not a transcendental number as it is a root of the polynomial equation x 2 − 2 = 0.

  6. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.

  7. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  8. Rational irrationality - Wikipedia

    en.wikipedia.org/wiki/Rational_irrationality

    Rational irrationality is not doublethink and does not state that the individual deliberately chooses to believe something he or she knows to be false. Rather, the theory is that when the costs of having erroneous beliefs are low, people relax their intellectual standards and allow themselves to be more easily influenced by fallacious reasoning, cognitive biases, and emotional appeals.

  9. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    The usual modules for making HTTP requests are comprised by the libwww-perl collection (LWP) , and there are a number of modules available for constructing requests (e.g. HTML::Form) and parsing HTML (HTML::Parser), which can be obtained from CPAN. ‣ᓛᖁ ᑐ 10:51, 2 December 2005 (UTC)