Periodicity and quasiperiodicity
Periodicty is the quality or state of being periodic, recurring at regular interval.
Periodic function
In mathematics a periodic function is a function that repeats its values in regular intervals. Examples are sinus, cosinus and tanget functions.
In physics periodic functions describe phenomena such as oscillations and waves.
Quasiperiodicity
Some systems display a pattern of recurrence with a component of unpredictability. The term quasiperiodicity can be used to describe such a system.
Physiology and medicine
In physiology/medicine the healthy heart rhythm (sinus rhythm), as measured by an ECG, is characterized by periodicity.
Heart rhythm disorders can be characterized by quasiperiodicity.
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Bibliography
-, -. Heart Rhythm Disorders [online]. [s.n.] ©-. [cit. 2013-01-17]. <http://www.emedicinehealth.com/heart_rhythm_disorders/article_em.htm>.
-, -. periodicity [online]. [s.n.] ©-. [cit. 2013-01-17]. <http://www.memidex.com/periodicity>.
-, -. Quasiperiodicity and chaos in cardiac fibrillation [online]. [s.n.] ©-. [cit. 2013-01-17]. <http://www.ncbi.nlm.nih.gov/pmc/articles/PMC507798/>.
-, -. periodicity [online]. [s.n.] ©-. [cit. 2013-01-17]. <http://www.thefreedictionary.com/periodicity>.
