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For a parabola oriented vertically and opening upwards, the vertex is the point where the curve reaches a minimum.

A parabolic cyclide formed by inversion of a spindle torus when the inversion sphere is tangent to the torus.

In the above figure, the sides a and b have the same length, appearances to the contrary. In the related illusion illustrated above, the interior lines appear to be of ...

A Pareto plot is type of plot used in quality control applications that combines a bar chart displaying percentages of categories in the data with a line graph showing ...

For a partial order, the size of the longest antichain is called the width.

Let A be a finite-dimensional power-associative algebra, then A is the vector space direct sum A=A_(11)+A_(10)+A_(01)+A_(00), where A_(ij), with i,j=0,1 is the subspace of A ...

If all elements a_(ij) of an irreducible matrix A are nonnegative, then R=minM_lambda is an eigenvalue of A and all the eigenvalues of A lie on the disk |z|<=R, where, if ...

The motion along a phase curve as a function of time (Tabor 1989, p. 14).

An adjoint curve which bears a special relation to the base curve.

Every bounded operator T acting on a Hilbert space H has a decomposition T=U|T|, where |T|=(T^*T)^(1/2) and U is a partial isometry. This decomposition is called polar ...