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| pertaining to applications in which the computer must respond as rapidly as required by the user or necessitated by the process being controlled |
| to save documents or data in a format usable by another software program |
differentiator
a device or set of components for performing the mathematical operation of differentiation-i.e., supplying an output proportional to the derivative of the input with respect to one or more variables. The many common examples of mechanical differentiators in which a displacement is differentiated with respect to time include speedometers and generators. In such devices, the derivative is frequently measured by deflections of spring-loaded elements
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