為定義域, Y {\displaystyle Y} 為值域的函數,可以視為兩集合之間的左全(英语:left-total relation)右唯一(英语:right-uniquerelation)的二元關係,因為可將函數與圖像等同。此觀點下,由 X {\displaystyle X} 到 Y {\displaystyle
1146/annurev-publhealth-031811-124636. Qin P, Agerbo E, Mortensen PB. Suicide risk in relation to socioecnomic, demographic, psychiatric, and familial factors: a national
J.H. 1997. Prey spectra of Bornean Nepenthes species (Nepenthaceae) in relation to their habitat.PDF Pertanika Journal of Tropical Agricultural Science