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  2. Ping-pong scheme - Wikipedia

    en.wikipedia.org/wiki/Ping-pong_scheme

    A functionality which lets a computer A find out whether a computer B is reachable and responding is built into the Internet Control Message Protocol (ICMP). Through an "Echo Request" Computer A asks B to send back an "Echo Reply". [2] These two messages are also sometimes called "ping" and "pong" for historical purposes. [citation needed]

  3. 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.

  4. 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.

  5. Merge sort - Wikipedia

    en.wikipedia.org/wiki/Merge_sort

    Doing so omits the copy operation and reduces the total number of moves by half. An early public domain implementation of a four-at-once merge was by WikiSort in 2014, the method was later that year described as an optimization for patience sorting and named a ping-pong merge. [10] [11] Quadsort implemented the method in 2020 and named it a ...

  6. Glossary of table tennis - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_table_tennis

    This glossary defines terms related to the sport of table tennis.. Alternation of ends After each game, players switch sides of the table. In the last possible game of a match, for example the seventh game in a best of seven matches, players change ends when the first player scores five points, regardless of whose turn it is to serve.

  7. Pickleball - Wikipedia

    en.wikipedia.org/wiki/Pickleball

    lowest points win Pickleball is a racket or paddle sport in which two players (singles) or four players (doubles) use a smooth-faced paddle to hit a perforated, hollow plastic ball over a 34-inch-high (0.86 m) net until one side is unable to return the ball or commits a rule infraction.

  8. Tennis for Two - Wikipedia

    en.wikipedia.org/wiki/Tennis_for_Two

    The first player would press the button on their controller to send the ball, a point of light, over the net, and it would either hit the net, reach the other side of the court, or fly out of bounds. The second player could then hit the ball back with their controller while it was on their side, either before or after it bounced on the ground. [3]

  9. Table tennis - Wikipedia

    en.wikipedia.org/wiki/Table_tennis

    In the second or the latter games of a match, the game begins in reverse order of play. For example, if the order of play is A→X→B→Y at beginning of the first game, the order begins with X→A→Y→B or Y→B→X→A in the second game depending on either X or Y being chosen as the first server of the game.