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A quadratic field Q(sqrt(D)) with D>0.

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

A reflexive relation.

The least positive integer m^* with the property that chi(y)=1 whenever y=1 (mod m^*) and (y,m)=1.

Euclidean n-space is denoted R^n.

A position in a game is safe for a player A if the person who plays next (player B) will lose.

The modular equation of degree five can be written (u/v)^3+(v/u)^3=2(u^2v^2-1/(u^2v^2)).

A property of finite simple groups which is known for all such groups.

A p-element x of a group G is semisimple if E(C_G(x))!=1, where E(H) is the commuting product of all components of H and C_G(x) is the centralizer of G.

In the American system, 10^(54).