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The central point in a wheel graph W_n. The hub has degree n-1.

A negative-height (inward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

e^(izcostheta)=sum_(n=-infty)^inftyi^nJ_n(z)e^(intheta), where J_n(z) is a Bessel function of the first kind. The identity can also be written ...

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 ...