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The inequality (j+1)a_j+a_i>=(j+1)i, which is satisfied by all A-sequences.

A node which is one graph edge further away from a given node in a rooted tree.

A Chu space is a binary relation from a set A to an antiset X which is defined as a set which transforms via converse functions.

A notation for large numbers due to Steinhaus (1999). In circle notation, is defined as n in n squares, where numbers written inside squares (and triangles) are interpreted ...

A partially ordered set P is a circle order if it is isomorphic to a set of disks ordered by containment.

A prime factorization algorithm.

A set of class representatives is a subset of X which contains exactly one element from each equivalence class.

A linear operator A:D(A)->H from its domain D(A) into a Hilbert space H is closed if for any sequence of vectors v_n in D(A) such that v_n->v and Av_n->x as n->infty, it ...

A subset of a topological group which is closed as a subset and also a subgroup.

The clove hitch is the hitch illustrated above that is also called the boatman's knot or peg knot.