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2. Gray code - Wikipedia

   en.wikipedia.org/wiki/Gray_code

   The cyclic binary code is also known as the cyclic progression code, the reflected binary code, and the Gray code. This code was originated by G. R. Stibitz, of Bell Telephone Laboratories, and was first proposed for pulse-code modulation systems by Frank Gray, also of BTL. Thus the name Gray code.

3. Puzzle solutions for Wednesday, Sept. 18

   www.aol.com/news/puzzle-solutions-wednesday-sept...

   Puzzle solutions for Wednesday, Sept. 18. USA TODAY. September 18, 2024 at 2:19 AM. Note: Most subscribers have some, but not all, of the puzzles that correspond to the following set of solutions ...

4. Puzzle solutions for Thursday, Sept. 5

   www.aol.com/news/puzzle-solutions-thursday-sept...

   USA TODAY. September 5, 2024 at 5:05 AM. Note: Most subscribers have some, but not all, of the puzzles that correspond to the following set of solutions for their local newspaper.

5. Cyclic redundancy check - Wikipedia

   en.wikipedia.org/wiki/Cyclic_redundancy_check

   A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. [1][2] Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents. On retrieval, the calculation is repeated ...

6. Cryptography - Wikipedia

   en.wikipedia.org/wiki/Cryptography

   However, in cryptography, code has a more specific meaning: the replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, "wallaby" replaces "attack at dawn"). A cypher, in contrast, is a scheme for changing or substituting an element below such a level (a letter, a syllable, or a pair of letters, etc ...

7. List of unsolved problems in mathematics - Wikipedia

   en.wikipedia.org/wiki/List_of_unsolved_problems...

   Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.