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  2. 0.0.0.0 - Wikipedia

    en.wikipedia.org/wiki/0.0.0.0

    These uses do not result in IPv4 packets containing 0.0.0.0 and so are not governed by RFC 1122. [2] These meanings may not be consistent between operating systems. In both Windows and Linux, when selecting which of a host's IP address to use as a source IP, a program may specify INADDR_ANY ( 0.0.0.0 ).

  3. Catalan number - Wikipedia

    en.wikipedia.org/wiki/Catalan_number

    The only known odd Catalan numbers that do not have last digit 5 are C 0 = 1, C 1 = 1, C 7 = 429, C 31, C 127 and C 255. The odd Catalan numbers, C n for n = 2 k − 1, do not have last digit 5 if n + 1 has a base 5 representation containing 0, 1 and 2 only, except in the least significant place, which could also be a 3. [3]

  4. Parity of zero - Wikipedia

    en.wikipedia.org/wiki/Parity_of_zero

    The box with 0 objects has no red object left over. [4]Given a set of objects, one uses a number to describe how many objects are in the set. Zero is the count of no objects; in more formal terms, it is the number of objects in the empty set.

  5. Division by zero - Wikipedia

    en.wikipedia.org/wiki/Division_by_zero

    A NaN (not a number) value represents undefined results. In IEEE arithmetic, division of 0/0 or ∞/∞ results in NaN, but otherwise division always produces a well-defined result. Dividing any non-zero number by positive zero (+0) results in an infinity of the same sign as the dividend.

  6. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function.

  7. Transponder (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Transponder_(aeronautics)

    A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...