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One of the four regions of the Plane defined by the four possible combinations of Signs $(+, +)$, $(+,-)$, $(-,+)$, and $(-,-)$ for $(x,y)$.

See also Octant, x-Axis, y-Axis


Courant, R. and Robbins, H. What is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed. Oxford, England: Oxford University Press, p. 73, 1996.

© 1996-9 Eric W. Weisstein