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  2. List of fictional hackers - Wikipedia

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  3. Polynomial - Wikipedia

    Since the 16th century, similar formulas (using cube roots in addition to square roots), but much more complicated are known for equations of degree three and four (see cubic equation and quartic equation). But formulas for degree 5 and higher eluded researchers for several centuries.

  4. Cubic function - Wikipedia

    The sign of the expression inside the square root determines the number of critical points. If it is positive, then there are two critical points, one is a local maximum, and the other is a local minimum. If b 2 – 3ac = 0, then there is only one critical point, which is an inflection point. If b 2 – 3ac < 0, then there are no (real ...

  5. 6 - Wikipedia

    6 is the root of the 6-aliquot tree, and is itself the aliquot sum of only one number; the square number, 25. Six is the only number that is both the sum and the product of three consecutive positive numbers. Unrelated to 6's being a perfect number, a Golomb ruler of length 6 is a "perfect ruler". Six is a congruent number.