Réfheidhmeanna

Ón Vicipéid, an chiclipéid shaor.
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Sa mhatamaitic, feidhmeanna mar f(x) = f(-x). Bíonn graf réfheidhme siméadrach thart ar an y-ais (mar shampla, y = x2 is y = cos x). Mar mhalairt, is corrfheidhm a leithéid seo: f(-x) = -f(x) (mar shampla, y = x3 is y = sin x).