# derivative of technology

*noun.*Also called: differential coefficient.

Let be a function. If, given in the interior of , the limit

exists, then the *derivative* or *differential coefficient* of at the point is defined to the value of that limit. As an alternative to (1), the limit

may be used.The value of the derivative at in the interior of is variously denoted

The function is the derivative of the function .

## Bibliography

**Howie, J. M. (2001),***Real Analysis*, Springer Undergraduate Mathematics Series, Springer-Verlag London Ltd., London. [ Amazon.com | Amazon.co.uk ]**Weisstein, E. (2005),**- World of Mathematics, http://mathworld.wolfram.com/.