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R^- denotes the real negative numbers.

A Radon measure is a Borel measure that is finite on compact sets.

A polynomial having only real numbers as coefficients. A polynomial with real coefficients is a product of irreducible polynomials of first and second degrees.

The space of currents arising from rectifiable sets by integrating a differential form is called the space of two-dimensional rectifiable currents. For C a closed bounded ...

A scalene triangle is a triangle that has three unequal sides, such as those illustrated above.

A topological space is second countable if it has a countable topological basis.

A semiprime ring which is also an Artinian ring.

The dual polyhedron of the small dodecicosidodecahedron U_(33) and Wenninger dual W_(72).

An affine transformation that preserves area.

A perimeter-bisecting line segment which originates at a vertex of a polygon. The three splitters of a triangle concur in a point known as the Nagel point Na.