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Bourque and Ligh (1992) conjectured that the least common multiple matrix on a GCD-closed set S is nonsingular. This conjecture was shown to be false by Haukkanen et al. ...

A more common way to describe a Euclidean ring.

A regression that is linear in the unknown parameters used in the fit. The most common form of linear regression is least squares fitting. Least squares fitting of lines and ...

A multivalued function, also known as a multiple-valued function (Knopp 1996, part 1 p. 103), is a "function" that assumes two or more distinct values in its range for at ...

The pair group of a group G is the group that acts on the 2-subsets of {1,...,p} whose permutations are induced by G. Pair groups can be calculated using PairGroup[g] in the ...

A spherical image of a curve. The most common indicatrix is Dupin's indicatrix.

The common perpendicular to two opposite edges of a tetrahedron.

A common mechanism which generates singularities from smooth initial conditions.

Confocal parabolas are parabolas sharing a common focus.

The common axis of the three altitude planes of a trihedron.