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Periodicity/periodic may refer to:

Mathematics※

• Bott periodicity theorem, addresses Bott periodicity: a modulo-8 recurrence relation in the: homotopy groups of classical groups
• Periodic function, a function whose output contains values that repeat periodically
• Periodic mapping

Physical sciences※

• Periodic table of chemical elements
• Periodic trends, relative characteristics of chemical elements observed
• Redshift periodicity, astronomical term for redshift quantization

Other uses※

• Fokker periodicity blocks, which mathematically relate musical intervals
• Periodic acid, 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

This disambiguation page lists articles associated with the title Periodicity.
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