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.
Links
Related articles
External links
Bibliography
Incomplete citation of web. . Heart Rhythm Disorders [online]. [cit. 2013-01-17]. <http://www.emedicinehealth.com/heart_rhythm_disorders/article_em.htm>.
Incomplete citation of web. . periodicity [online]. [cit. 2013-01-17]. <http://www.memidex.com/periodicity>.
Incomplete citation of web. . Quasiperiodicity and chaos in cardiac fibrillation [online]. [cit. 2013-01-17]. <http://www.ncbi.nlm.nih.gov/pmc/articles/PMC507798/>.
Incomplete citation of web. . periodicity [online]. [cit. 2013-01-17]. <http://www.thefreedictionary.com/periodicity>.