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  2. Three-body problem - Wikipedia

    en.wikipedia.org/wiki/Three-body_problem

    The three-body problem is a special case of the n-body problem, which describes how n objects move under one of the physical forces, such as gravity. These problems have a global analytical solution in the form of a convergent power series, as was proven by Karl F. Sundman for n = 3 and by Qiudong Wang for n > 3 (see n-body problem for details

  3. Time crystal - Wikipedia

    en.wikipedia.org/wiki/Time_crystal

    A time crystal can be informally defined as a time-periodic self-organizing structure. While an ordinary crystal is periodic (has a repeating structure) in space, a time crystal has a repeating structure in time. A time crystal is periodic in time in the same sense that the pendulum in a pendulum-driven clock is periodic in time.

  4. Numerical continuation - Wikipedia

    en.wikipedia.org/wiki/Numerical_continuation

    A periodic motion is a closed curve in phase space. That is, for some period, ′ = (,), = (). The textbook example of a periodic motion is the undamped pendulum.. If the phase space is periodic in one or more coordinates, say () = (+), with a vector [clarification needed], then there is a second kind of periodic motions defined by

  5. Simple harmonic motion - Wikipedia

    en.wikipedia.org/wiki/Simple_harmonic_motion

    Thus simple harmonic motion is a type of periodic motion. If energy is lost in the system, then the mass exhibits damped oscillation. Note if the real space and phase space plot are not co-linear, the phase space motion becomes elliptical. The area enclosed depends on the amplitude and the maximum momentum.

  6. Classical central-force problem - Wikipedia

    en.wikipedia.org/.../Classical_central-force_problem

    The problem is also important because some more complicated problems in classical physics (such as the two-body problem with forces along the line connecting the two bodies) can be reduced to a central-force problem. Finally, the solution to the central-force problem often makes a good initial approximation of the true motion, as in calculating ...

  7. Communities facing air pollution threats worry about EPA ...

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    In the U.S., the biggest polluters are often concentrated in underserved, mostly minority communities.

  8. Accenture Q1 Earnings: Revenue And EPS Beat Bolstered By ...

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    Adjusted operating income for the quarter was $2.70 billion, or 16.7% of revenues. Products revenues reached $5.43 billion, up 12% in U.S. dollars and 10% in local currency. Health & Public ...

  9. Oscillation - Wikipedia

    en.wikipedia.org/wiki/Oscillation

    The second term of x(t) is the transient solution to the differential equation. The transient solution can be found by using the initial conditions of the system. Some systems can be excited by energy transfer from the environment. This transfer typically occurs where systems are embedded in some fluid flow.

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