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A set A of integers is recursively isomorphic to set B if there is a bijective recursive function f such that f(A)=B.

Every nonempty set of positive integers contains a smallest member.

Let I(x,y) denote the set of all vertices lying on an (x,y)-graph geodesic in G, then a set S with I(S)=V(G) is called a geodetic set in G and is denoted g(G).

A set of statistical distributions having the same variance.

A system of equations is any set of simultaneous equations.

Also called indiscrete topology, the trivial topology is the smallest topology on a set X, namely the one in which the only open sets are the empty set and the entire set X. ...

The smallest statistical rank (either up or down) of a set of data.

The set of rules for manipulating and calculating with tensors.

The unitary group U_n(q) is the set of n×n unitary matrices.

A subgraph G^' of a graph G is a graph G^' whose vertex set and edge set are subsets of those of G. If G^' is a subgraph of G, then G is said to be a supergraph of G^' ...