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# quadrant

The $x$- and $y$-axes divide the $xy$-plane in four right-angle domains which are called the quadrants of the plane. They are numbered going round the origin in anticlockwise direction so that

$\{(x,\,y)\mid x>0,\,\,y>0\}$ |

is the first quadrant,

$\{(x,\,y)\mid x<0,\,\,y>0\}$ |

the second quadrant, and so on.

Naturally, one can speak of the quadrants of the complex plane, too.

Defines:

1st quadrant, 2nd quadrant, 3rd quadrant, 4th quadrant

Related:

RightAngle, ConvexAngle, Octant

Synonym:

quarter-plane

Type of Math Object:

Definition

Major Section:

Reference

Groups audience:

## Mathematics Subject Classification

51N20*no label found*

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new question: Prove that for any sets A, B, and C, An(BUC)=(AnB)U(AnC) by St_Louis

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new image: information-theoretic-distributed-measurement-dds.png by rspuzio

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new image: information-theoretic-distributed-measurement-2.1 by rspuzio

Apr 19

new collection: On the Information-Theoretic Structure of Distributed Measurements by rspuzio

Apr 15

new question: Prove a formula is part of the Gentzen System by LadyAnne

Mar 30

new question: A problem about Euler's totient function by mbhatia