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| the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force |
| the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth |
| Fourier analysis
The branch of mathematics concerned with the approximation of periodic functions by the Fourier series and with generalizations of such approximations to a wider class of functions. |