duals

Noun

dual (plural duals)

1. Of an item that is one of a pair, the other item in the pair.
2. Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
   • The octahedron is the dual of the cube. The icosahedron is the dual of the dodecahedron.
3. The dual number.
4. Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
5. A head-to-head match or meet between two teams, such as two high schools or colleges.
   • Wrestling duals and meets take place at the Wisconsin Field House. There are no advance single event ticket sales.2010 August 3, Kevin Revolinski, Insiders' Guide® to Madison, WI, Rowman & Littlefield, →ISBN, page 137

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