Quotient

In arithmetic, a quotient (from Latin: quotiens "how many times", pronounced /ˈkwʃənt/) is a quantity produced by the division of two numbers.[1] The quotient has widespread use throughout mathematics, and is commonly referred to as the integer part of a division (in the case of Euclidean division),[2][3] or as a fraction or a ratio (in the case of proper division). For example, when dividing 20 (the dividend) by 3 (the divisor), the quotient is 6 in the Euclidean division sense, and in the proper division sense. In the second sense, a quotient is simply the ratio of a dividend to its divisor.

12 apples divided into 4 groups of 3 each.
The quotient of 12 apples by 3 apples is 4.

NotationEdit

The quotient is most frequently encountered as two numbers, or two variables, divided by a horizontal line. The words "dividend" and "divisor" refer to each individual part, while the word "quotient" refers to the whole.

 

Integer part definitionEdit

The quotient is also less commonly defined as the greatest whole number of times a divisor may be subtracted from a dividend—before making the remainder negative. For example, the divisor 3 may be subtracted up to 6 times from the dividend 20, before the remainder becomes negative:

20 − 3 − 3 − 3 − 3 − 3 − 3 ≥ 0,

while

20 − 3 − 3 − 3 − 3 − 3 − 3 − 3 < 0.

In this sense, a quotient is the integer part of the ratio of two numbers.[4]

Quotient of two integersEdit

A rational number can be defined as the quotient of two integers (as long as the denominator is non-zero).

A more detailed definition goes as follows:[5]

A real number r is rational, if and only if it can be expressed as a quotient of two integers with a nonzero denominator. A real number that is not rational is irrational.

Or more formally:

Given a real number r, r is rational if and only if there exists integers a and b such that   and  .

The existence of irrational numbers—numbers that are not a quotient of two integers—was first discovered in geometry, in such things as the ratio of the diagonal to the side in a square.[6]

More general quotientsEdit

Outside of arithmetic, many branches of mathematics have borrowed the word "quotient" to describe structures built by breaking larger structures into pieces. Given a set with an equivalence relation defined on it, a "quotient set" may be created which contains those equivalence classes as elements. A quotient group may be formed by breaking a group into a number of similar cosets, while a quotient space may be formed in a similar process by breaking a vector space into a number of similar linear subspaces.

See alsoEdit

ReferencesEdit

  1. ^ "Quotient". Dictionary.com.
  2. ^ "The Definitive Higher Math Guide to Long Division and Its Variants for Integers (Euclidean Division — Terminology)". Math Vault. 2019-02-24. Retrieved 2020-08-27.
  3. ^ Weisstein, Eric W. "Integer Division". mathworld.wolfram.com. Retrieved 2020-08-27.
  4. ^ Weisstein, Eric W. "Quotient". MathWorld.
  5. ^ Epp, Susanna S. (2011-01-01). Discrete mathematics with applications. Brooks/Cole. p. 163. ISBN 9780495391326. OCLC 970542319.
  6. ^ "Irrationality of the square root of 2". www.math.utah.edu. Retrieved 2020-08-27.