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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    As order of magnitude gets the greatest prominence when using a slide rule, users are less likely to make errors of false precision. When performing a sequence of multiplications or divisions by the same number, the answer can often be determined by merely glancing at the slide rule without any manipulation.

  3. Slide rule scale - Wikipedia

    en.wikipedia.org/wiki/Slide_rule_scale

    A slide rule scale is a line with graduated markings inscribed along the length of a slide rule used for mathematical calculations. The earliest such device had a single logarithmic scale for performing multiplication and division, but soon an improved technique was developed which involved two such scales sliding alongside each other.

  4. 15 puzzle - Wikipedia

    en.wikipedia.org/wiki/15_puzzle

    Because the combinations of the 15 puzzle can be generated by 3-cycles, it can be proved that the 15 puzzle can be represented by the alternating group. [15] In fact, any 2 k − 1 {\\displaystyle 2k-1} sliding puzzle with square tiles of equal size can be represented by A 2 k − 1 {\\displaystyle A_{2k-1}} .

  5. Verification and validation of computer simulation models

    en.wikipedia.org/wiki/Verification_and...

    There are many approaches that can be used to validate a computer model. The approaches range from subjective reviews to objective statistical tests. One approach that is commonly used is to have the model builders determine validity of the model through a series of tests. [3]

  6. Move emails into folders in New AOL Mail

    help.aol.com/articles/move-emails-into-folders...

    Organize your email messages by putting them into folders where they're easy to locate. You can move emails from your inbox into a folder or move them from one folder to another. 1. Select the emails you want to move. 2. Click Move. 3. Select the folder where you want the email to go.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    Animation of the missing square puzzle, showing the two arrangements of the pieces and the "missing" square Both "total triangles" are in a perfect 13×5 grid; and both the "component triangles", the blue in a 5×2 grid and the red in an 8×3 grid.

  9. Separation of variables - Wikipedia

    en.wikipedia.org/wiki/Separation_of_variables

    In orthogonal curvilinear coordinates, separation of variables can still be used, but in some details different from that in Cartesian coordinates. For instance, regularity or periodic condition may determine the eigenvalues in place of boundary conditions. See spherical harmonics for example.