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The order n>=2 L-polyomino consists of a vertical line of n squares with a single additional square attached at the bottom.

A Liouville Space, also known as line space or "extended" Hilbert space, it is the Cartesian product of two Hilbert spaces.

The pedal coordinates of a point P with respect to the curve C and the pedal point O are the radial distance r from O to P and the perpendicular distance p from O to the line ...

A one-dimensional line segment where two two-dimensional faces of an n-dimensional polytope meet, also called a side.

A circular cone the centers of whose sections form a line perpendicular to the bases. When used without qualification, the term "cone" often refers to a right circular cone.

A circular cylinder the centers of whose sections form a line perpendicular to the bases. When used without qualification, the term "cylinder" often refers to a right ...

A translation along a straight line L and a rotation about L such that the angle of rotation is proportional to the translation at each instant. Also known as a twist.

If a triangle is inscribed in a conic section, any line conjugate to one side meets the other two sides in conjugate points.

The distance a point moves due to shear divided by the perpendicular distance of a point from the invariant line.

The mean square deviation of the best local fit straight line to a staircase cumulative spectral density over a normalized energy scale.