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A quantity which is either 0 (zero) or positive, i.e., >=0.

Sampling at the Nyquist frequency.

An 80-sided polygon.

A nonsingular linear map A:R^n->R^n is orientation-reversing if det(A)<0.

Two subspaces S_1 and S_2 of R^n are said to be orthogonal if the dot product v_1·v_2=0 for all vectors v_1 in S_1 and all v_2 in S_2.

Approximants derived by expanding a function as a ratio of two power series and determining both the numerator and denominator coefficients. Padé approximations are usually ...

A statistical test in which assumptions are made about the underlying distribution of observed data.

A 5-polyabolo.

One of the four 5-polyiamonds are called pentiamonds.

A tensor g whose discriminant satisfies g=g_(11)g_(22)-g_(12)^2>0.