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  2. Western Electric hand telephone sets - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_hand...

    Hand telephone sets consist of three principal parts: the handset, a handset mounting, and an apparatus box, called variously desk set box, bell box, subscriber set, or just subset. This box is typically mounted on a wall or desk-side, and contains an electromagnetic bell ringer and a speech transformer , called induction coil , to connect the ...

  3. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    A subset series of the Unified Thread Standard, with controlled root radius and increased minor diameter. For applications requiring maximum fatigue resistance amid chronic vibration (such as in aircraft). UNJF: Unified National "J" series Fine: A subset series of the Unified Thread Standard, with controlled root radius and increased minor ...

  4. Subset - Wikipedia

    en.wikipedia.org/wiki/Subset

    In mathematics, a set A is a subset of a set B if all elements of A are also elements of B; B is then a superset of A. It is possible for A and B to be equal; if they are unequal, then A is a proper subset of B. The relationship of one set being a subset of another is called inclusion (or sometimes containment).

  5. Axiom schema of specification - Wikipedia

    en.wikipedia.org/wiki/Axiom_schema_of_specification

    In many popular versions of axiomatic set theory, the axiom schema of specification, [1] also known as the axiom schema of separation (Aussonderungsaxiom), [2] subset axiom [3], axiom of class construction, [4] or axiom schema of restricted comprehension is an axiom schema. Essentially, it says that any definable subclass of a set is a set.

  6. Speaker wire - Wikipedia

    en.wikipedia.org/wiki/Speaker_wire

    Ordinary lamp cord has an inductance of 0.1–0.2 μH/ft, likewise for shielded cord, [6] so a run of up to about 10 feet (20 total feet of conductor) will have less than 1% inductive loss in the audible range (10 ft * 0.2 μH/ft = 2.0 μH, which is at or below the proximate threshold of 2 μH given above). Some premium speaker cables have ...

  7. Welded wire mesh - Wikipedia

    en.wikipedia.org/wiki/Welded_wire_mesh

    This type of mesh is a square grid of uniformly placed wires, welded at all intersections, and meeting the requirements of ASTM A185 and A497 or other standards. [1] The sizes are specified by combining the spacing, in inches or mm, and the wire cross section area in hundredths of square inches or mm2.

  8. Axiom of extensionality - Wikipedia

    en.wikipedia.org/wiki/Axiom_of_extensionality

    Quine's New Foundations (NF) set theory, in Quine's original presentations of it, treats the symbol = for equality or identity as shorthand either for "if a set contains the left side of the equals sign as a member, then it also contains the right side of the equals sign as a member" (as defined in 1937), or for "an object is an element of the set on the left side of the equals sign if, and ...

  9. Powerset construction - Wikipedia

    en.wikipedia.org/wiki/Powerset_construction

    [8] [9] A simple example requiring nearly this many states is the language of strings over the alphabet {0,1} in which there are at least n characters, the n th from last of which is 1. It can be represented by an ( n + 1) -state NFA, but it requires 2 n DFA states, one for each n -character suffix of the input; cf. picture for n =4 .