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  2. Chicago, Burlington and Quincy Railroad - Wikipedia

    en.wikipedia.org/wiki/Chicago,_Burlington_and...

    The Chicago, Burlington and Quincy Railroad (reporting mark CBQ) was a railroad that operated in the Midwestern United States.Commonly referred to as the Burlington Route, the Burlington, CB&Q, or as the Q, [2] [3] it operated extensive trackage in the states of Colorado, Illinois, Iowa, Missouri, Nebraska, Wisconsin, Wyoming, and also in Texas through subsidiaries Colorado and Southern ...

  3. Dirac bracket - Wikipedia

    en.wikipedia.org/wiki/Dirac_bracket

    When applying canonical quantization on a constrained Hamiltonian system, the commutator of the operators is supplanted by iħ times their classical Dirac bracket. Since the Dirac bracket respects the constraints, one need not be careful about evaluating all brackets before using any weak equations, as is the case with the Poisson bracket.

  4. Yorkshire and the Humber - Wikipedia

    en.wikipedia.org/wiki/Yorkshire_and_the_Humber

    Leeds has a fairly extensive commuter network and an electrified section in the North of Bradford provides many commuter services. Sheffield has a smaller commuter rail network and there are also less extensive systems in Doncaster, Huddersfield, Wakefield and Harrogate, which connect the districts of the settlements to the centre by rail.

  5. B-tree - Wikipedia

    en.wikipedia.org/wiki/B-tree

    Some operating systems require the user to allocate the maximum size of the file when the file is created. The file can then be allocated as contiguous disk blocks. In that case, to convert the file block address i {\displaystyle i} into a disk block address, the operating system simply adds the file block address i {\displaystyle i} to the ...

  6. QWERTY - Wikipedia

    en.wikipedia.org/wiki/QWERTY

    Comparisons have been made between Dvorak, Colemak, QWERTY, and other keyboard input systems, namely stenotype or its electronic implementations. However, stenotype is a fundamentally different system, which relies on phonetics and simultaneous key presses or chords.

  7. Linear–quadratic regulator - Wikipedia

    en.wikipedia.org/wiki/Linear–quadratic_regulator

    The case where the system dynamics are described by a set of linear differential equations and the cost is described by a quadratic function is called the LQ problem. One of the main results in the theory is that the solution is provided by the linear–quadratic regulator ( LQR ), a feedback controller whose equations are given below.