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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

  3. Simplification - Wikipedia

    en.wikipedia.org/wiki/Simplification

    Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:

  4. Five-point stencil - Wikipedia

    en.wikipedia.org/wiki/Five-point_stencil

    An illustration of the five-point stencil in one and two dimensions (top, and bottom, respectively). In numerical analysis, given a square grid in one or two dimensions, the five-point stencil of a point in the grid is a stencil made up of the point itself together with its four "neighbors".

  5. 4F - Wikipedia

    en.wikipedia.org/wiki/4F

    4F correlator, in Fourier optics; The 4f electron shell; Section 4(f) of the United States DOT act of 1966, which regulates acquiring park and historic properties for transportation use. 4F case, a 4 February 2006 controversial criminal case in Barcelona; Flottille 4F a French naval aviation squadron; LMS Fowler Class 4F, a class of 0-6-0 steam ...

  6. Heterogeneous water oxidation - Wikipedia

    en.wikipedia.org/wiki/Heterogeneous_Water_Oxidation

    2H 2 O → O 2 + 4H + + 4e − Oxidation (generation of dioxygen) 4H + + 4e − → 2H 2 Reduction (generation of dihydrogen) 2H 2 O → 2H 2 + O 2 Total Reaction Of the two half reactions, the oxidation step is the most demanding because it requires the coupling of 4 electron and proton transfers and the formation of an oxygen-oxygen bond.

  7. Stretched exponential function - Wikipedia

    en.wikipedia.org/wiki/Stretched_exponential_function

    Following the usual physical interpretation, we interpret the function argument t as time, and f β (t) is the differential distribution.The area under the curve can thus be interpreted as a mean relaxation time.

  8. V-Cube 6 - Wikipedia

    en.wikipedia.org/wiki/V-Cube_6

    The V-Cube 6 is a 6×6×6 version of the original Rubik's Cube. The first mass-produced 6×6×6 was invented by Panagiotis Verdes and is produced by the Greek company Verdes Innovations SA. Other such puzzles have since been introduced by a number of Chinese companies, most of which have mechanisms which improve on the original.

  9. Naval flight officer - Wikipedia

    en.wikipedia.org/wiki/Naval_flight_officer

    A-4 Skyhawk as students in the TA-4J, as TOPGUN adversary instructors in the TA-4F and TA-4J, as forward air controllers in the OA-4M (USMC only), and as electronic warfare officers in the EA-4F. A-5A (formerly A3J-1), A-5B (formerly A3J-2) and RA-5C (formerly A3J-3P) Vigilante serving as bombardier/navigator in the A-5A and A-5B and ...