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The covering of a plane curve with disks of radius epsilon whose centers lie on the curve.

Virtually nothing is known about dissection of a projective plane using unequal squares.

An object is reflexible if it is superposable with its image in a plane mirror. Also called amphichiral.

The slope-intercept form of a line in the Cartesian plane is given by y=mx+b, where b is the y-intercept and m is the slope.

A square grid is a grid formed by tiling the plane regularly with squares.

A parallel of a surface of revolution is the intersection of the surface with a plane orthogonal to the axis of revolution.

The unit upper half-disk is the portion of the complex plane satisfying {|z|<=1,I[z]>0}.

The Riemann sphere C^*=C union {infty}, also called the extended complex plane. The notation C^^ is sometimes also used (Krantz 1999, p. 82). The notation C^* is also used to ...

A foliation F of dimension p on a manifold M is transversely orientable if it is integral to a p-plane distribution D on M whose normal bundle Q is orientable. A p-plane ...

A two-dimensional affine geometry constructed over a finite field. For a field F of size n, the affine plane consists of the set of points which are ordered pairs of elements ...