Power


gives to the power .

DetailsDetails

  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • Exact rational number results are given when possible for roots of the form .
  • For complex numbers and , Power gives the principal value of . »
  • is automatically converted to only if is an integer.
  • is automatically converted to only if is an integer.
  • For certain special arguments, Power automatically evaluates to exact values.
  • Power can be evaluated to arbitrary numerical precision.
  • Power automatically threads over lists.
  • Power[x,y] has a branch cut discontinuity for noninteger running from to 0 in the complex plane.
  • Power[x,y,z,] is taken to be Power[x,Power[y,z,]].

Background
Background

  • Power is a mathematical function that raises an expression to a given power. The expression Power[x,y] is commonly represented using the shorthand syntax or written in 2D typeset form as . A number to the first power is equal to itself (), and 1 to any complex power is equal to 1 (). The inverse of a power function is a Logarithm, so solving the equation for b gives a principal solution of b=.
  • The operation of taking an expression to the second power is known as squaring and the operation of taking an expression to the third power is known as cubing. The rules for combining quantities containing powers are called the exponent laws, and the process of raising a base to a given power is known as exponentiation. Many expressions involving Power, Exp, Log, and related functions are automatically simplified, or else may be simplified using Simplify or FullSimplify. PowerExpand can be used to do formal expansion and associated simplification, and ExpToTrig can be used to get trigonometric forms of Power expressions.
  • The function Sqrt[x] is represented using Power[x,1/2]. Exponentiation using the base of the natural logarithm E can be input as Exp[x] but is represented using Power[E,x].
  • Power[x,y] has a branch cut discontinuity for y running from to 0 in the complex x plane for noninteger y. Because of this branch cut, Power[x,1/n] returns a complex root by default instead of the real one for negative real x and odd positive n. To obtain a real-valued n^(th) root, Surd[x,n] can be used. The special case CubeRoot[x] corresponds to Surd[x,3].
Introduced in 1988
(1.0)