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  2. Three-body problem - Wikipedia

    en.wikipedia.org/wiki/Three-body_problem

    An animation of the figure-8 solution to the three-body problem over a single period T ≃ 6.3259 [13] 20 examples of periodic solutions to the three-body problem. In the 1970s, Michel Hénon and Roger A. Broucke each found a set of solutions that form part of the same family of solutions: the Broucke–Hénon–Hadjidemetriou family. In this ...

  3. Euler's three-body problem - Wikipedia

    en.wikipedia.org/wiki/Euler's_three-body_problem

    The problem of two fixed centers conserves energy; in other words, the total energy is a constant of motion.The potential energy is given by =where represents the particle's position, and and are the distances between the particle and the centers of force; and are constants that measure the strength of the first and second forces, respectively.

  4. If a tree falls in a forest and no one is around to hear it ...

    en.wikipedia.org/wiki/If_a_tree_falls_in_a_forest...

    The falling of the tree or any other disturbance will produce vibration of the air. If there be no ears to hear, there will be no sound." [6] The current phrasing appears to have originated in the 1910 book Physics by Charles Riborg Mann and George Ransom Twiss. The question "When a tree falls in a lonely forest, and no animal is near by to ...

  5. Bethe lattice - Wikipedia

    en.wikipedia.org/wiki/Bethe_lattice

    In statistical mechanics and mathematics, the Bethe lattice (also called a regular tree) is an infinite symmetric regular tree where all vertices have the same number of neighbors. The Bethe lattice was introduced into the physics literature by Hans Bethe in 1935.

  6. The Three-Body Problem (novel) - Wikipedia

    en.wikipedia.org/wiki/The_Three-Body_Problem_(novel)

    A leader of the "Redemptionist" faction of the ETO, she aims to develop a solution to the three-body problem that will save the Trisolaran civilization. She is murdered by her factional rival Pan Han. Wei Cheng (魏成) Math prodigy, recluse, and Shen Yufei's husband. With Shen's support, he develops a possible solution to the three-body problem.

  7. n-body problem - Wikipedia

    en.wikipedia.org/wiki/N-body_problem

    Some present physics and astronomy textbooks do not emphasize the negative significance of Newton's assumption and end up teaching that his mathematical model is in effect reality. It is to be understood that the classical two-body problem solution above is a mathematical idealization. See also Kepler's first law of planetary motion.

  8. Instanton - Wikipedia

    en.wikipedia.org/wiki/Instanton

    An instanton (or pseudoparticle [1] [2] [3]) is a notion appearing in theoretical and mathematical physics.An instanton is a classical solution to equations of motion with a finite, non-zero action, either in quantum mechanics or in quantum field theory.

  9. Two-body problem - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem

    However, the one-body approximation is usually unnecessary except as a stepping stone. For many forces, including gravitational ones, the general version of the two-body problem can be reduced to a pair of one-body problems, allowing it to be solved completely, and giving a solution simple enough to be used effectively.