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The locus of lines meeting three given skew lines. ("Regulus" is also the name of the brightest star in the constellation Leo.)

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

A shift in phase.

The Reye graph is the transposition graph G_4 of order 4.

An (n-2)-dimensional face of an n-dimensional polytope.

Euclidean n-space is denoted R^n.

An operator definition of a function. A Rodrigues formula may be converted into a Schläfli integral.

A 1×n matrix [a_(11) a_(12) ... a_(1n)].

A surface possessing a saddle point.

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