Differanse operatorer
| Forover differanse | <jsm>\Delta\, u(x)=u(x+h)-u(x)</jsm> |
| Bakover differanse | <jsm>\nabla\, u(x)=u(x)-u(x-h)</jsm> |
| Sentral differanse | <jsm>\delta\, u(x)=u(x+\frac{h}{2})-u(x-\frac{h}{2})</jsm> |
| Middelverdi | <jsm>\mu\, u(x)=\frac{1}{2}[u(x+\frac{h}{2})+u(x-\frac{h}{2}) ]</jsm> |
| Skift | <jsm>E \,u(x)=u(x+h)</jsm> |
| Enhet operator | <jsm>\mathbb{1}\, u(x)=u(x)</jsm> |