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A quartic plane curve is a plane curve of the fourth degree. It can be defined by a quartic equation:

$Ax^{4}+By^{4}+Cx^{3}y+Dx^{2}y^{2}+Exy^{3}+Fx^{3}+Gy^{3}+Hx^{2}y+Ixy^{2}+Jx^{2}+Ky^{2}+Lxy+Mx+Ny+P=0.$

This equation has fifteen constants. However, it can be multiplied by any non-zero constant without changing the curve. Therefore, the space of quartic curves can be identified with the real projective space $\mathbb {RP} ^{14}$. It also follows that there is exactly one quartic curve that passes through a set of fourteen distinct points in general position, since a quartic has 14 degrees of freedom.

A quartic curve can have a maximum of:

• Four connected components
• Twenty-eight bi-tangents
• Three ordinary double points.

Examples

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Bicorn curve	Klein quartic
Bullet-nose curve	Lemniscate of Bernoulli
Cartesian oval	Lemniscate of Gerono
Cassini oval	Lüroth quartic
Deltoid curve	Spiric section
Hippopede	Toric section
Kampyle of Eudoxus	Trott curve

Ampersand curve

The ampersand curve is a quartic plane curve given by the equation:

$\ (y^{2}-x^{2})(x-1)(2x-3)=4(x^{2}+y^{2}-2x)^{2}.$

It is an algebraic curve of genus zero, with three ordinary double points, all in the real plane.

Bean curve

The bean curve is a quartic plane curve with the equation:

$x^{4}+x^{2}y^{2}+y^{4}=x(x^{2}+y^{2})\,$

The bean curve is a plane algebraic curve of genus zero. It has one singularity at the origin, an ordinary triple point.

Bicuspid curve

The biscuspid is a quartic plane curve with the equation

$(x^{2}-a^{2})(x-a)^{2}+(y^{2}-a^{2})^{2}=0\,$

where a determines the size of the curve. The bicuspid has only the two nodes as singularities, and hence is a curve of genus one.

Bow curve

The bow curve is a quartic plane curve with the equation:

$x^{4}=x^{2}y-y^{3}.\,$

The bow curve has a single triple point at x=0, y=0, and consequently is a rational curve, with genus zero.

Cruciform curve

The cruciform curve, or cross curve is a quartic plane curve given by the equation

$x^{2}y^{2}-b^{2}x^{2}-a^{2}y^{2}=0\,$

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 a²x² + b²y² = 1, and is therefore a rational plane algebraic curve of genus zero. The cruciform curve has three double points in the real projective plane, at x=0 and y=0, x=0 and z=0, and y=0 and z=0.

Because the curve is rational, it can be parametrized by rational functions. For instance, if a=1 and b=2, then

$x=-{\frac {t^{2}-2t+5}{t^{2}-2t-3}},y={\frac {t^{2}-2t+5}{2t-2}}$

parametrizes the points on the curve outside of the exceptional cases where the denominator is zero.

Spiric section

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. Spiric sections can be defined as bicircular quartic curves that are symmetric with respect to the xand y-axes. Spiric sections are included in the family of toric sections and include the family of hippopedes and the family of Cassini ovals. The name is from σπειρα meaning torus in ancient Greek.

Three-leaved clover

The three-leaved clover is a quartic plane curve

$x^{4}+2x^{2}y^{2}+y^{4}-x^{3}+3xy^{2}=0\,$

Alternatively, parametric equation of three-leaved clover is:

$x=\cos(3t)\cos t,y=\cos(3t)\sin t\,$

Or in polar coordinates (x = r cos φ, y = r sin φ):

$r=\cos(3\varphi )\,$

It is a special case of rose curve with k = 3. This curve has a triple point at the origin (0, 0) and has three double tangents.