Definition:Lemniscate of Bernoulli/Polar Definition

Definition
The lemniscate of Bernoulli is the curve defined by the polar equation:
 * $r^2 = 2 a^2 \cos 2 \theta$


 * LemniscateOfBernoulli.png

Also see

 * Equivalence of Definitions of Lemniscate of Bernoulli