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A negative integer is one of the integers ..., -4, -3, -2, -1 obtained by negating the positive integers. The negative integers are commonly denoted Z^-.
A quantity which is either 0 (zero) or negative, i.e., <=0.
A triangle that is not a right triangle.
The Paley class of a positive integer m=0 (mod 4) is defined as the set of all possible quadruples (k,e,q,n) where m=2^e(q^n+1), (1) q is an odd prime, and k={0 if q=0; 1 if ...
The interval (generally, the smallest interval) over which the values of a periodic function recur. Functions may have one or more periods over time and in space.
To find the minimum distance between a point in the plane (x_0,y_0) and a quadratic plane curve y=a_0+a_1x+a_2x^2, (1) note that the square of the distance is r^2 = ...
The homeomorphic image of a so-called "complete separable" metric space. The continuous image of a Polish space is called a Souslin set.
A quantity x>0, which may be written with an explicit plus sign for emphasis, +x.
The curve with trilinear coordinates a^t:b^t:c^t for a given power t.
Let S be a collection of subsets of a set X and let mu:S->[0,infty] be a set function. The function mu is called a premeasure provided that mu is finitely additive, countably ...

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