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Feidhm pheiriadach
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Sa mhatamaitic, feidhm cosúil le f(x + a) = f(x) do gach x. Más a an tairiseach dearfach is lú a chomhlíonann an chothromóid seo, is é a peiriad nó tréimhse na feidhme. Is iad na feidhmeanna peiriadacha is coitianta an síneas agus an comhshíneas. I gcás shíneas kx, is é (2 π)/k an peiriad.[1]
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