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A relation R on a set S is reflexive provided that xRx for every x in S.

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

A system of equations is any set of simultaneous equations.

The set of rules for manipulating and calculating with tensors.

A distance graph with distance set (0,1].

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

If f is a function on an open set U, then the zero set of f is the set Z={z in U:f(z)=0}. A subset of a topological space X is called a zero set if it is equal to f^(-1)(0) ...

Fatou dust is a Fatou set for a point outside the underlying set. Such a set has zero area and has an infinite number of disconnected components.

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).

The Mandelbar set is a fractal set analogous to the Mandelbrot set or its generalization to a higher power with the variable z replaced by its complex conjugate z^_.