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  2. Aiken code - Wikipedia

    en.wikipedia.org/wiki/Aiken_code

    The Aiken code (also known as 2421 code) [1] [2] is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table. The code was developed by Howard Hathaway Aiken and is still used today in digital clocks, pocket calculators and similar devices [citation needed].

  3. Rational data type - Wikipedia

    en.wikipedia.org/wiki/Rational_data_type

    A variable or value of that type is usually represented as a fraction m/n where m and n are two integer numbers, either with a fixed or arbitrary precision.Depending on the language, the denominator n may be constrained to be non-zero, and the two numbers may be kept in reduced form (without any common divisors except 1).

  4. BCH code - Wikipedia

    en.wikipedia.org/wiki/BCH_code

    For any positive integer i, let m i (x) be the minimal polynomial with coefficients in GF(q) of α i. The generator polynomial of the BCH code is defined as the least common multiple g(x) = lcm(m 1 (x),…,m d − 1 (x)). It can be seen that g(x) is a polynomial with coefficients in GF(q) and divides x n − 1.

  5. 2-satisfiability - Wikipedia

    en.wikipedia.org/wiki/2-satisfiability

    Suppose that a 2-satisfiability instance contains two clauses that both use the same variable x, but that x is negated in one clause and not in the other. Then the two clauses may be combined to produce a third clause, having the two other literals in the two clauses; this third clause must also be satisfied whenever the first two clauses are ...

  6. Rank error-correcting code - Wikipedia

    en.wikipedia.org/wiki/Rank_error-correcting_code

    There are several known constructions of rank codes, which are maximum rank distance (or MRD) codes with d = n − k + 1. The easiest one to construct is known as the (generalized) Gabidulin code, it was discovered first by Delsarte (who called it a Singleton system ) and later by Gabidulin [ 2 ] (and Kshevetskiy [ 3 ] ).

  7. List of FTP server return codes - Wikipedia

    en.wikipedia.org/.../List_of_FTP_server_return_codes

    FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range

  8. Adaptive Huffman coding - Wikipedia

    en.wikipedia.org/wiki/Adaptive_Huffman_coding

    For "a" transmit its binary code. Step 2: NYT spawns two child nodes: 254 and 255, both with weight 0. Increase weight for root and 255. Code for "a", associated with node 255, is 1. For "b" transmit 0 (for NYT node) then its binary code. Step 3: NYT spawns two child nodes: 252 for NYT and 253 for leaf node, both with weight 0.

  9. Two-out-of-five code - Wikipedia

    en.wikipedia.org/wiki/Two-out-of-five_code

    The IBM 7070, IBM 7072, and IBM 7074 computers used this code to represent each of the ten decimal digits in a machine word, although they numbered the bit positions 0-1-2-3-4, rather than with weights. Each word also had a sign flag, encoded using a two-out-of-three code, that could be A Alphanumeric, − Minus, or + Plus. When copied to a ...