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The multiplication operation corresponding to the Lie bracket.

The lengths of the tangents from a point P to a conic C are proportional to the cube roots of the radii of curvature of C at the corresponding points of contact.

The lower-trimmed subsequence of x={x_n} is the sequence V(x) obtained by subtracting 1 from each x_n and then removing all 0s. If x is a fractal sequence, then V(x) is a ...

The lower matching number of a graph is the minimum size of a maximal independent edge set. The (upper) matching number may be similarly defined as the largest size of an ...

A theorem which treats constructions of fields of field characteristic p.

The second-order ordinary differential equation y^('')+alpha(x)y^'+x^2y^n=0.

A nonempty set is a set containing one or more elements. Any set other than the empty set emptyset is therefore a nonempty set. Nonempty sets are sometimes also called ...

An impartial game in which the last player wins. In normal-form games, the nim-value of the sum of two games is the nim-sum of their nim-values.

The reciprocity theorem for x^8=q (mod p).

An edge of a graph is said to be pendant if one of its vertices is a pendant vertex.