Periodicity or periodic may refer to:
Mathematics
*
Bott periodicity theorem
In mathematics, the Bott periodicity theorem describes a periodicity in the homotopy groups of classical groups, discovered by , which proved to be of foundational significance for much further research, in particular in K-theory of stable comple ...
, addresses Bott periodicity: a modulo-8 recurrence relation in the homotopy groups of classical groups
*
Periodic function
A periodic function, also called a periodic waveform (or simply periodic wave), is a function that repeats its values at regular intervals or periods. The repeatable part of the function or waveform is called a ''cycle''. For example, the t ...
, a function whose output contains values that repeat periodically
*
Periodic mapping
In mathematics, in the study of iterated functions and dynamical systems, a periodic point of a function is a point which the system returns to after a certain number of function iterations or a certain amount of time.
Iterated functions
Giv ...
Physical sciences
*
Periodic table
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods") and columns (" groups"). It is an icon of chemistry and is widely used in physics and other s ...
of chemical elements
*
Periodic trends
In chemistry, periodic trends are specific patterns present in the periodic table that illustrate different aspects of certain Chemical element, elements when grouped by period (periodic table), period and/or Group (periodic table), group. They w ...
, relative characteristics of chemical elements observed
* Redshift periodicity, astronomical term for
redshift quantization
Redshift quantization, also referred to as redshift periodicity, redshift discretization, preferred redshifts and redshift-magnitude bands, is the hypothesis that the redshifts of cosmologically distant objects (in particular galaxies and quasar ...
Other uses
*
Fokker periodicity blocks
Fokker periodicity blocks are a concept in tuning theory used to mathematically relate musical intervals in just intonation to those in equal tuning. They are named after Adriaan Daniël Fokker. These are included as the primary subset of wha ...
, which mathematically relate musical intervals
*
Periodic acid
Periodic acid ( ) is an oxoacid of iodine. It can exist in two forms: orthoperiodic acid, with the chemical formula , and metaperiodic acid, which has the formula . Periodic acids are colourless crystals. Periodic acid features iodine in the hig ...
, a compound of iodine
* Principle of periodicity, a concept in
generally accepted accounting principles
*
Quasiperiodicity, property of a system that displays irregular periodicity
See also
*
Aperiodic (disambiguation)
*
Cycle (disambiguation)
*
Frequency (disambiguation)
*
Period (disambiguation)
*
Periodical
*
Seasonality, periodic variation, or periodic fluctuations
{{disambiguation