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  2. Cube root - Wikipedia

    The cube root is the inverse function of the cube function if considering only real numbers, but not if considering also complex numbers: although one has always () =, the cube of a nonzero number has more than one complex cube root and its principal cube root may not be the number that was cubed.

  3. nth root - Wikipedia

    A root of degree 2 is called a square root and a root of degree 3, a cube root. Roots of higher degree are referred by using ordinal numbers, as in fourth root, twentieth root, etc. The computation of an n th root is a root extraction. For example, 3 is a square root of 9, since 3 2 = 9, and −3 is also a square root of 9, since (−3) 2 = 9.

  4. Square–cube law - Wikipedia–cube_law

    Steam engine: James Watt, working as an instrument maker for the University of Glasgow, was given a scale model Newcomen steam engine to put in working order. Watt recognized the problem as being related to the square–cube law, in that the surface to volume ratio of the model's cylinder was greater than that of the much larger commercial engines, leading to excessive heat loss.

  5. Square root of 5 - Wikipedia

    The square root of 5 is the positive real number that, when multiplied by itself, gives the prime number 5. It is more precisely called the principal square root of 5 , to distinguish it from the negative number with the same property.

  6. Digital root - Wikipedia

    The digital root (also repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum. The process continues until a single-digit number is reached.

  7. 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 ...

  8. Imaginary unit - Wikipedia

    The imaginary unit or unit imaginary number (i) is a solution to the quadratic equation x 2 + 1 = 0.Although there is no real number with this property, i can be used to extend the real numbers to what are called complex numbers, using addition and multiplication.

  9. Astraeus - Wikipedia

    Ἀστήρ itself is inherited from the Proto-Indo-European root *h₂ster-(“star”), from *h₂eh₁s- , “to burn”. "Astraea" shares this same etymology. Mythology. According to Hesiod's Theogony and Bibliotheca, Astraeus is a second-generation Titan, descended from Crius and Eurybia.