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  2. Irrational number - Wikipedia

    en.wikipedia.org/wiki/Irrational_number

    Because the algebraic numbers form a subfield of the real numbers, many irrational real numbers can be constructed by combining transcendental and algebraic numbers. For example, 3 π + 2, π + √ 2 and e √ 3 are irrational (and even transcendental).

  3. Sexagesimal - Wikipedia

    en.wikipedia.org/wiki/Sexagesimal

    The sexagesimal number system continued to be frequently used by ... giving as an example the number 49‵‵‵‵36 ... 2 π is an irrational number and cannot be ...

  4. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    All rational numbers are real, but the converse is not true. Irrational numbers (): Real numbers that are not rational. Imaginary numbers: Numbers that equal the product of a real number and the imaginary unit , where =. The number 0 is both real and imaginary.

  5. Category:Irrational numbers - Wikipedia

    en.wikipedia.org/wiki/Category:Irrational_numbers

    In mathematics, an irrational number is any real number that is not a rational number, i.e., one that cannot be written as a fraction a / b with a and b integers and b not zero. This is also known as being incommensurable, or without common measure. The irrational numbers are precisely those numbers whose expansion in any given base (decimal ...

  6. Golden ratio base - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio_base

    Golden ratio base is a non-integer positional numeral system that uses the golden ratio (the irrational number + ≈ 1.61803399 symbolized by the Greek letter φ) as its base. It is sometimes referred to as base-φ, golden mean base, phi-base, or, colloquially, phinary.

  7. Dedekind cut - Wikipedia

    en.wikipedia.org/wiki/Dedekind_cut

    Otherwise, that cut defines a unique irrational number which, loosely speaking, fills the "gap" between A and B. [3] In other words, A contains every rational number less than the cut, and B contains every rational number greater than or equal to the cut. An irrational cut is equated to an irrational number which is in neither set.

  8. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    For example, "11" represents the number eleven in the decimal or base-10 numeral system (today, the most common system globally), the number three in the binary or base-2 numeral system (used in modern computers), and the number two in the unary numeral system (used in tallying scores). The number the numeral represents is called its value.

  9. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    The earliest known use of irrational numbers was in the Indian Sulba Sutras composed between 800 ... the base of the decimal system. Thus, for example, one half is 0. ...