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  2. Ross–Littlewood paradox - Wikipedia

    en.wikipedia.org/wiki/Ross–Littlewood_paradox

    A graph that shows the number of balls in and out of the vase for the first ten iterations of the problem. The Ross–Littlewood paradox (also known as the balls and vase problem or the ping pong ball problem) is a hypothetical problem in abstract mathematics and logic designed to illustrate the paradoxical, or at least non-intuitive, nature of infinity.

  3. Ping-pong lemma - Wikipedia

    en.wikipedia.org/wiki/Ping-pong_lemma

    The ping-pong lemma was a key tool used by Jacques Tits in his 1972 paper [2] containing the proof of a famous result now known as the Tits alternative. The result states that a finitely generated linear group is either virtually solvable or contains a free subgroup of rank two.

  4. Upper and lower bounds - Wikipedia

    en.wikipedia.org/wiki/Upper_and_lower_bounds

    The definitions can be generalized to functions and even to sets of functions. Given a function f with domain D and a preordered set (K, ≤) as codomain, an element y of K is an upper bound of f if y ≥ f (x) for each x in D. The upper bound is called sharp if equality holds for at least one value of x. It indicates that the constraint is ...

  5. Order (ring theory) - Wikipedia

    en.wikipedia.org/wiki/Order_(ring_theory)

    When is not a commutative ring, the idea of order is still important, but the phenomena are different. For example, the Hurwitz quaternions form a maximal order in the quaternions with rational co-ordinates; they are not the quaternions with integer coordinates in the most obvious sense. Maximal orders exist in general, but need not be unique ...

  6. Ping-pong (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Ping-pong_(disambiguation)

    Ping-pong, or table tennis, is a sport where players hit a lightweight ball back and forth across a table. Ping-Pong , Ping Pong , or Pingpong may also refer to: Diplomatic and legislative affairs

  7. Spaldeen - Wikipedia

    en.wikipedia.org/wiki/Spaldeen

    Modern-day Spaldeen. A Spalding Hi-Bounce Ball, often called a Spaldeen or a Pensie Pinkie, is a rubber ball, described as a tennis ball core without the felt. [1] These balls are commonly used in street games developed in the mid-20th century, such as Chinese handball (a variation on American handball), Australian Handball, stoop ball, hit-the-penny (involving trying to make a penny flip on a ...