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Definisjonsmengde

Illustrasjonen viser f som en funksjon fra definisjonsmengden X til verdiområdet Y. Det mindre området inne i Y er verdimengden til f, også kalt bildet.
Grafen til den reelle funksjonen , som er definert for alle positive reelle tall (inkludert 0).

Definisjonsmengden, domenet eller kilden/kjelda til en funksjon f er alle punkter som kan mates inn i funksjonen. For eksempel kan funksjonen ha, eller defineres over, definisjonsmengden .

Dersom f er en reell funksjon av en eller flere variable angitt ved en formel, så er det underforstått at definisjonsmengden er alle punkter hvor formelen er veldefinert.

Eksterne lenker

[rediger | rediger kilde]
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Definisjonsmengde
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