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

### Other articles related to "time, time derivative, derivative":

... Calculations that involve the

**time**-dependent deformation of a body often require a

**time derivative**of the deformation gradient to be calculated ... A geometrically consistent definition of such a

**derivative**requires an excursion into differential geometry but we avoid those issues in this article ... The

**time derivative**of is where is the velocity ...

... the origin to the particle location where is the unit vector parallel to the radius vector at

**time**t and pointing away from the origin ... The velocity is the

**time derivative**of the displacement Because the radius of the circle is constant, the radial component of the velocity is zero ... The unit vector has a

**time**-invariant magnitude of unity, so as

**time**varies its tip always lies on a circle of unit radius, with an angle θ the same as the angle of ...

... Now taking the

**time derivative**of The goal is to get the

**time derivative**to be which is globally exponentially stable if is globally positive definite (which it is) ... This control law will guarantee global exponential stability since upon substitution into the

**time derivative**yields, as expected which is a linear first order differential equation which has solution And ...

... These functions are called stationary states, because the

**time derivative**at any point x is always the same, so the amplitude of the wave function never changes in

**time**... measurable, the system does not change in

**time**... We've removed the imaginary number from the

**time derivative**and added in a constant offset of, which is the ground state energy ...

### Famous quotes containing the words derivative and/or time:

“When we say “science” we can either mean any manipulation of the inventive and organizing power of the human intellect: or we can mean such an extremely different thing as the religion of science the vulgarized *derivative* from this pure activity manipulated by a sort of priestcraft into a great religious and political weapon.”

—Wyndham Lewis (1882–1957)

“The manuscript lay like a dust-rag on his desk, and Eitel found, as he had found before, that the difficulty of art was that it forced a man back on his life, and each *time* the task was more difficult and distasteful.”

—Norman Mailer (b. 1923)