Polar set (potential theory)

The lemniscate of Gerono

In algebraic geometry, the lemniscate of Gerono, or lemnicate of Huygens, or figure-eight curve, is a plane algebraic curve of degree four and genus zero and is a lemniscate curve shaped like an $\mathrm{\infty }$ symbol, or figure eight. It has equation

$x^4-x^2+y^2=0.$

It was studied by Camille-Christophe Gerono.

Because the curve is of genus zero, it can be parametrized by rational functions; one means of doing that is

$x=\frac{t^2-1}{t^2+1},y=\frac{2t(t^2-1)}{(t^2+1{)}^2}.$

Another representation is

$x=\cos \phi ,y=\sin \phi \cos \phi =\sin (2\phi )/2$

which reveals that this lemniscate is a special case of a lissajous figure.

The dual curve (see Plücker formula), pictured below, has therefore a somewhat different character. Its equation is

$(x^2-y^2{)}^3+8y^4+20x^2{y}^2-x^4-16y^2=0.$

Dual to the lemniscate of Gerono

References

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