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  2. System of linear equations - Wikipedia

    en.wikipedia.org/wiki/System_of_linear_equations

    The solution set for the equations x − y = −1 and 3x + y = 9 is the single point (2, 3). A solution of a linear system is an assignment of values to the variables ,, …, such that each of the equations is satisfied. The set of all possible solutions is called the solution set. [5]

  3. Crack (password software) - Wikipedia

    en.wikipedia.org/wiki/Crack_(password_software)

    The first public release of Crack was version 2.7a, which was posted to the Usenet newsgroups alt.sources and alt.security on 15 July 1991. Crack v3.2a+fcrypt, posted to comp.sources.misc on 23 August 1991, introduced an optimised version of the Unix crypt() function but was still only really a faster version of what was already available in other packages.

  4. Crack growth equation - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_equation

    Many crack propagation equations have been proposed over the years to improve prediction accuracy and incorporate a variety of effects. The works of Head, [6] Frost and Dugdale, [7] McEvily and Illg, [8] and Liu [9] on fatigue crack-growth behaviour laid the foundation in this topic. The general form of these crack propagation equations may be ...

  5. 1 + 2 + 3 + 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = ⁠ 1 / 6 ⁠, B 4 = ⁠− + 1 / 30 ⁠, and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]

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  7. Crack Comics - Wikipedia

    en.wikipedia.org/wiki/Crack_Comics

    Crack Comics is an anthology comic book series published by Quality Comics during the Golden Age of Comic Books. [1] It featured such characters as The Clock , Black Condor , Captain Triumph , Alias the Spider , Madame Fatal , Jane Arden , Molly the Model, and Red Torpedo .

  8. 4-6-4-4 - Wikipedia

    en.wikipedia.org/wiki/4-6-4-4

    Swiss classification: 3/5+2/4 up to the early 1920s, later 5/9 The sole example of this arrangement was the PRR Q1 . This locomotive was essentially a prototype in the development of the PRR Q2, a 4-4-6-4 .

  9. 4-4-2+2-4-4 - Wikipedia

    en.wikipedia.org/wiki/4-4-2+2-4-4

    Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-4-2+2-4-4 is a Garratt articulated locomotive.The wheel arrangement is effectively two 4-4-2 locomotives operating back to back, with each power unit having four leading wheels on two axles in a leading bogie, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle ...