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In mathematics, a cell is a finite regular polytope.

The surface given by the parametric equations x = e^(bv)cosv+e^(av)cosucosv (1) y = e^(bv)sinv+e^(av)cosusinv (2) z = e^(av)sinu. (3) For a=b=1, the coefficients of the first ...

The 6-polyiamond illustrated above.

An equilateral parallelogram whose acute angles are 45 degrees. Sometimes, the restriction to 45 degrees is dropped, and it is required only that two opposite angles are ...

A stable fixed point of a map which, in a dissipative dynamical system, is an attractor.

An oval whose construction is illustrated in the above diagram.

Let X_1 and X_2 be the number of successes in variates taken from two populations. Define p^^_1 = (x_1)/(n_1) (1) p^^_2 = (x_2)/(n_2). (2) The estimator of the difference is ...

In random number computation, a seed is an initial number used as the starting point in a random number generating algorithm. In a dynamical system, a seed is a starting ...

A requirement necessary for a given statement or theorem to hold. Also called a criterion.

The term "ill-defined" is also used informally to mean ambiguous.