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  2. Ball transfer unit - Wikipedia

    en.wikipedia.org/wiki/Ball_transfer_unit

    Ball transfer unit Cross-section through a spring-loaded ball transfer unit with a polymer seal ring and a drain hole in the bottom. A ball transfer unit is an omnidirectional load-bearing sphere mounted inside a restraining fixture. They are identical in principle to a computer trackball (pointing device). Typically the design involves a ...

  3. Fast-growing hierarchy - Wikipedia

    en.wikipedia.org/wiki/Fast-growing_hierarchy

    In computability theory, computational complexity theory and proof theory, a fast-growing hierarchy (also called an extended Grzegorczyk hierarchy, or a Schwichtenberg-Wainer hierarchy) [1] is an ordinal-indexed family of rapidly increasing functions f α: N → N (where N is the set of natural numbers {0, 1, ...}, and α ranges up to some large countable ordinal).

  4. Caster - Wikipedia

    en.wikipedia.org/wiki/Caster

    Caster flutter can be controlled by adding dampers or increasing the friction of the swivel joints. [3] This can be accomplished by adding washers to the swivel joint. The friction increases as the weight on the front of the chair increases. Anytime the caster begins to flutter, it slows the chair and shifts weight to the front wheels.

  5. Slow-growing hierarchy - Wikipedia

    en.wikipedia.org/wiki/Slow-growing_hierarchy

    The slow-growing hierarchy grows much more slowly than the fast-growing hierarchy. Even g ε 0 is only equivalent to f 3 and g α only attains the growth of f ε 0 (the first function that Peano arithmetic cannot prove total in the hierarchy) when α is the Bachmann–Howard ordinal. [2] [3] [4]

  6. 16-inch softball - Wikipedia

    en.wikipedia.org/wiki/16-inch_softball

    16-inch softball (sometimes called clincher, mushball, [1] cabbageball, [2] [3] puffball, blooperball, smushball, [4] and Chicago ball [5] [6]) is a variant of softball, but using a larger ball that gradually becomes softer the more the ball is hit, and played with no gloves or mitts on the fielders.

  7. Hardy hierarchy - Wikipedia

    en.wikipedia.org/wiki/Hardy_hierarchy

    It is related to the fast-growing hierarchy and slow-growing hierarchy. Hardy hierarchy is introduced by Stanley S. Wainer in 1972, [ 1 ] [ 2 ] but the idea of its definition comes from Hardy's 1904 paper, [ 2 ] [ 3 ] in which Hardy exhibits a set of reals with cardinality ℵ 1 {\displaystyle \aleph _{1}} .

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