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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.)

One out of a set of identical observations in a given experiment under identical conditions.

The residual is the sum of deviations from a best-fit curve of arbitrary form. R=sum[y_i-f(x_i,a_1,...,a_n)]^2. The residual should not be confused with the correlation ...

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.

If the fourth moment mu_4!=0, then P(|x^_-mu_4|>=lambda)<=(mu_4+3(N-1)sigma^4)/(N^3lambda^4), where sigma^2 is the variance.

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

Abstractly, a spatial configuration F is said to possess rotational symmetry if F remains invariant under the group C=C(F). Here, C(F) denotes the group of rotations of F and ...

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