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A triangle line lalpha+mbeta+ngamma=0 defined relative to a reference triangle is called a central line iff l:m:n is a triangle center (Kimberling 1998, p. 127). If l:m:n is ...

The gear graph, also sometimes known as a bipartite wheel graph (Brandstädt et al. 1987), is a wheel graph with a graph vertex added between each pair of adjacent graph ...

Sociable numbers are numbers that result in a periodic aliquot sequence, where an aliquot sequence is the sequence of numbers obtained by repeatedly applying the restricted ...

The map H_n(X,A)->H_(n-1)(A) appearing in the long exact sequence of a pair axiom.

Complete digraphs are digraphs in which every pair of nodes is connected by a bidirectional edge.

An operator L^~ is said to be linear if, for every pair of functions f and g and scalar t, L^~(f+g)=L^~f+L^~g and L^~(tf)=tL^~f.

If a sphere is covered by three closed sets, then one of them must contain a pair of antipodal points.

Somewhere on the Earth, there is a pair of antipodal points having simultaneously the same temperature and pressure.

The space join of a topological space X and a pair of points S^0, Sigma(X)=X*S^0.

Given an amicable pair (m,n), the quantity sigma(m) = sigma(n) (1) = =s(m)+s(n) (2) = m+n (3) is called the pair sum, where sigma(n) is the divisor function and s(n) is the ...