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In mathematics, a quartic equation is one which can be expressed as a quartic function equaling zero. The general form of a quartic equation is The general form of a quartic equation is Graph of a polynomial function of degree 4, with its 4 roots and 3 critical points .
In algebra, a quartic function is a function of the form = + + + +, α. where a is nonzero, which is defined by a polynomial of degree four, called a quartic polynomial. A quartic equation, or equation of the fourth degree, is an equation that equates a quartic polynomial to zero, of the form
Quartic reciprocity, a theorem from number theory; Quartic surface, a surface defined by an equation of degree 4; See also. All pages with titles beginning with Quartic ; All pages with titles containing Quartic; Quart (disambiguation) Quintic, relating to degree 5, as next higher above quartic; Cubic (disambiguation), relating to degree 3 or a ...
Solving quintic equations in terms of radicals (nth roots) was a major problem in algebra from the 16th century, when cubic and quartic equations were solved, until the first half of the 19th century, when the impossibility of such a general solution was proved with the Abel–Ruffini theorem.
Polynomial equations of degree two can be solved with the quadratic formula, which has been known since antiquity.Similarly the cubic formula for degree three, and the quartic formula for degree four, were found during the 16th century.
It is not a resolvent invariant for G, because being invariant by (12), it is in fact a resolvent invariant for the larger dihedral subgroup D 4: (12), (1324) , and is used to define the resolvent cubic of the quartic equation. If P is a resolvent invariant for a group G of index m inside S n, then its orbit under S n has order m.
The cruciform curve, or cross curve is a quartic plane curve given by the equation = where a and b are two parameters determining the shape of the curve. The cruciform curve is related by a standard quadratic transformation, x ↦ 1/x, y ↦ 1/y to the ellipse a 2 x 2 + b 2 y 2 = 1, and is therefore a rational plane algebraic curve of genus zero.
In mathematics, especially in algebraic geometry, a quartic surface is a surface defined by an equation of degree 4. More specifically there are two closely related types of quartic surface: affine and projective. An affine quartic surface is the solution set of an equation of the form (,,) =