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  2. List of representations of e - Wikipedia

    en.wikipedia.org/wiki/List_of_representations_of_e

    Since e is an irrational number (see proof that e is irrational), it cannot be represented as the quotient of two integers, but it can be represented as a continued fraction. Using calculus , e may also be represented as an infinite series , infinite product , or other types of limit of a sequence .

  3. Biblical and Talmudic units of measurement - Wikipedia

    en.wikipedia.org/wiki/Biblical_and_Talmudic...

    2 lethek = 1 kor; The kezayit is, by different sources, considered equal to 12 a beitza, 1 ⁄ 3 of a beitza, or not directly related to the other units of volume. The omer, which the Torah mentions as being equal to one-tenth of an ephah, [30] is equivalent to the capacity of 43.2 eggs, or what is also known as one-tenth of three seahs. [31]

  4. Mathematical coincidence - Wikipedia

    en.wikipedia.org/wiki/Mathematical_coincidence

    The upper limit of gravity on Earth's surface (9.87 m/s 2) is equal to π 2 m/s 2 to four significant figures. It is approximately 0.6% greater than standard gravity (9.80665 m/s 2 ). Rydberg constant

  5. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    Its two equal sides are in the golden ratio to its base. [47] The triangle formed by two sides and a diagonal of a regular pentagon is called a golden gnomon . It is an obtuse isosceles triangle with apex angle ⁠ 108 ∘ {\displaystyle 108^{\circ }} ⁠ and base angle ⁠ 36 ∘ {\displaystyle 36^{\circ }\!} ⁠ .

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 21 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠ Multiplication (often denoted by the cross symbol × , by the mid-line dot operator ⋅ , by juxtaposition, or, on computers, by an asterisk * ) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition ...

  7. Fold change - Wikipedia

    en.wikipedia.org/wiki/Fold_change

    Conversely, the measure is symmetric when the change decreases by an equivalent amount e.g. a halving is equal to a log 2 fold change of −1, a quartering is equal to a log 2 fold change of −2 and so on. This leads to more aesthetically pleasing plots, as exponential changes are displayed as linear and so the dynamic range is increased.

  8. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    When an object is divided into equal parts, each part is a unit fraction of the whole. Multiplying two unit fractions produces another unit fraction, but other arithmetic operations do not preserve unit fractions. In modular arithmetic, unit fractions can be converted into equivalent whole numbers, allowing modular division to be transformed ...

  9. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For instance, the numeral for 10,405 uses one time the symbol for 10,000, four times the symbol for 100, and five times the symbol for 1. A similar well-known framework is the Roman numeral system. It has the symbols I, V, X, L, C, D, M as its basic numerals to represent the numbers 1, 5, 10, 50, 100, 500, and 1000. [33]