Time Derivative

A time derivative is a derivative of a function with respect to time, usually interpreted as the rate of change of the value of the function. The variable denoting time is usually written as .

Read more about Time Derivative:  Notation, Use in Physics, Use in Economics, See Also

Famous quotes containing the words time and/or derivative:

    ...we avoid hospitals because ... they’ll kill you there. They overtreat you. And when they see how old you are, and that you still have a mind, they treat you like a curiosity: like “Exhibit A” and “Exhibit B.” Like, “Hey. nurse, come on over here and looky-here at this old woman, she’s in such good shape....” . Most of the time they don’t even treat you like a person, just an object.
    Annie Elizabeth Delany (b. 1891)

    Poor John Field!—I trust he does not read this, unless he will improve by it,—thinking to live by some derivative old-country mode in this primitive new country.... With his horizon all his own, yet he a poor man, born to be poor, with his inherited Irish poverty or poor life, his Adam’s grandmother and boggy ways, not to rise in this world, he nor his posterity, till their wading webbed bog-trotting feet get talaria to their heels.
    Henry David Thoreau (1817–1862)