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Find necessary and sufficient conditions that determine when the integral curve of two periodic functions kappa(s) and tau(s) with the same period L is a closed curve.

A geometric figure which touches only the sides (or interior) of another figure.

Given any straight line and a point not on it, there "exists one and only one straight line which passes" through that point and never intersects the first line, no matter ...

In the American system, 10^(15).

A quadratic field Q(sqrt(D)) with D>0.

The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an n-gon is itself an n-gon.

A polynomial with three terms.

Kepler's original name for the small stellated dodecahedron.

Solving the wave equation on a disk gives a solution in terms of Bessel functions.

The Cassini ovals are a family of quartic curves, also called Cassini ellipses, described by a point such that the product of its distances from two fixed points a distance ...