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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 correction: Define Galois correspondence by porton

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new correction: Closure properties on languages: DCFL not closed under reversal by babou

new correction: DCFLs are not closed under reversal by petey

Oct 2

new correction: Many corrections by Smarandache

Sep 28

new question: how to contest an entry? by zorba

new question: simple question by parag

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new question: Latent variable by adam_reith