Helicoid parabola
Helicoid Hel"i*coid, a. [Gr. ?; ?, ?, spiral + ? shape: cf. F. h['e]lico["i]de. See {Helix}.] [1913 Webster] 1. Spiral; curved, like the spire of a univalve shell. [1913 Webster]

2. (Zo["o]l.) Shaped like a snail shell; pertaining to the {Helicid[ae]}, or Snail family. [1913 Webster]

{Helicoid parabola} (Math.), the parabolic spiral. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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• Helicoid — Hel i*coid, a. [Gr. ?; ?, ?, spiral + ? shape: cf. F. h[ e]lico[ i]de. See {Helix}.] [1913 Webster] 1. Spiral; curved, like the spire of a univalve shell. [1913 Webster] 2. (Zo[ o]l.) Shaped like a snail shell; pertaining to the {Helicid[ae]}, or …   The Collaborative International Dictionary of English

• Multivariable calculus — Topics in Calculus Fundamental theorem Limits of functions Continuity Mean value theorem Differential calculus  Derivative Change of variables Implicit differentiation Taylor s theorem Related rates …   Wikipedia

• Integral of secant cubed — One of the more challenging indefinite integrals of elementary calculus is:int sec^3 x , dx = frac{1}{2}sec x an x + frac{1}{2}ln|sec x + an x| + C.There are a number of reasons why this particular antiderivative is worthy of special attention:*… …   Wikipedia

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