Periodicity or periodic may refer to:
Mathematics
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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 comp ...
, addresses Bott periodicity: a modulo-8 recurrence relation in the homotopy groups of classical groups
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Periodic function
A periodic function is a function that repeats its values at regular intervals. For example, the trigonometric functions, which repeat at intervals of 2\pi radians, are periodic functions. Periodic functions are used throughout science to des ...
, a function whose output contains values that repeat periodically
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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
Given a ...
Physical sciences
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Periodic table of chemical elements
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Periodic trends
Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element. They were discovered by the Russian chemist Dmitri Mendeleev in the year 1863. Major periodic trends include atom ...
, 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 quasars) ...
Other uses
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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 what ...
, which mathematically relate musical intervals
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Periodic acid
Periodic acid ( ) is the highest oxoacid of iodine, in which the iodine exists in oxidation state +7. Like all periodates it can exist in two forms: orthoperiodic acid, with the chemical formula , and metaperiodic acid, which has the formula . ...
, a compound of iodine
* Principle of periodicity, a concept in
generally accepted accounting principles
Publicly traded companies typically are subject to rigorous standards. Small and midsized businesses often follow more simplified standards, plus any specific disclosures required by their specific lenders and shareholders. Some firms operate on th ...
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Quasiperiodicity
Quasiperiodicity is the property of a system that displays irregular periodicity. Periodic behavior is defined as recurring at regular intervals, such as "every 24 hours". Quasiperiodic behavior is a pattern of recurrence with a component of unpred ...
, property of a system that displays irregular periodicity
See also
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Aperiodic (disambiguation)
Aperiodic means non-periodic.
Typically it refers to aperiodic function.
Aperiodic may also refer to:
* Aperiodic finite state automaton
* Aperiodic frequency
* Aperiodic graph
* Aperiodic semigroup In mathematics, an aperiodic semigroup is a ...
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Cycle (disambiguation)
Cycle, cycles, or cyclic may refer to:
Anthropology and social sciences
* Cyclic history, a theory of history
* Cyclical theory, a theory of American political history associated with Arthur Schlesinger, Sr.
* Social cycle, various cycles in so ...
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Frequency (disambiguation)
Frequency refers to how often an event occurs within a given period.
Frequency may also refer to:
Entertainment
* ''Frequency'' (2000 film), a film starring Jim Caviezel and Dennis Quaid
* ''Frequency'' (2019 film), a Burmese horror film
* ''Fr ...
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Period (disambiguation)
Period may refer to:
Common uses
* Era, a length or span of time
* Full stop (or period), a punctuation mark
Arts, entertainment, and media
* Period (music), a concept in musical composition
* Periodic sentence (or rhetorical period), a concept ...
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Periodical
A periodical literature (also called a periodical publication or simply a periodical) is a published work that appears in a new edition on a regular schedule. The most familiar example is a newspaper, but a magazine or a journal are also example ...
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Seasonality
In time series data, seasonality is the presence of variations that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly. Seasonality may be caused by various factors, such as weather, vacation, and holidays a ...
, periodic variation, or periodic fluctuations
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