# Parity

Parity may refer to:

• Parity (physics), a symmetry property of physical quantities or processes under spatial inversion
• Parity (mathematics), indicates whether a number is even or odd
• Parity of a permutation, indicates whether a permutation has an even or odd number of inversions
• Parity function, a Boolean function whose value is 1 if the input vector has an odd number of ones
• Parity flag in computing, indicates if the number of set bits is odd or even in the binary representation of the result of the last operation
• Parity bit in computing, sets the parity of transmitted data for the purpose of error detection
• Parity file in data processing, created in conjunction with data files and used to check data integrity and assist in data recovery
• Parity (biology), the number of times a woman or female animal has given birth
• Parity (charity), UK equal rights organisation
• Parity (law), legal principle
• Purchasing power parity, in economics, the exchange rate required to equalise the purchasing power of different currencies
• Interest rate parity, in finance, the notion that the differential in interest rates between two countries is equal to the differential between the forward exchange rate and the spot exchange rate
• Put–call parity, in financial mathematics, defines a relationship between the price of a European call option and a European put option
• Parity (sports), an equal playing field for all participants, regardless of their economic circumstances
• Potty parity, equalization of waiting times for males and females in restroom queues
• A tactic in reversi
• Grid parity of renewable energy

### Other articles related to "parity":

Parity Of Zero
... In other words, its parity—the quality of an integer being even or odd—is even ... The parity rules of arithmetic, such as even − even = even, require 0 to be even ... Among the general public, the parity of zero can be a source of confusion ...
Parity (charity) - History
... Parity was formed in 1986 as "Campaign for Equal State Pension Ages" (CESPA) and its principal aim was to obtain for men the same state pension rights at age 60 as are enjoyed by women ... The organisation changed its name to "Parity" in 1997 to reflect growing concern regarding increased unequal treatment of men and women by the state ... Parity was denied charitable status for a number of years because it was seeking changes in the law to redress statutory sex discrimination, and thus was deemed to be political ...
Spin (physics) - Spin and Parity
... This refers to the parity with "+" for even parity (wave function unchanged by spatial inversion) and "−" for odd parity (wave function negated by spatial ...
Parity Problem (sieve Theory)
... In number theory, the parity problem refers to a limitation in sieve theory that prevents sieves from giving good estimates in many kinds of prime-counting problems ... around 1996, John Friedlander and Henryk Iwaniec developed some parity-sensitive sieves that make the parity problem less of an obstacle ...

### Famous quotes containing the word parity:

The U.S. is becoming an increasingly fatherless society. A generation ago, an American child could reasonably expect to grow up with his or her father. Today an American child can reasonably expect not to. Fatherlessness is now approaching a rough parity with fatherhood as a defining feature of American childhood.
David Blankenhorn (20th century)