( ! ) Notice: session_start() [function.session-start]: Server 127.0.0.1 (tcp 21201) failed with: Failed reading line from stream (0) in /var/www/html/common-2.2/SWAT/SWAT.php5 on line 108
Call Stack
#	Time	Memory	Function	Location
1	0.0065	93280	{main}( )	../dictionary.php5:0
2	0.0079	170520	include_once( '/var/www/html/interactivate-java/config/standardIncludes.php5' )	../dictionary.php5:3
3	0.1612	14248864	SWAT->startSession( )	../standardIncludes.php5:110
4	0.1613	14248864	session_start ( )	../SWAT.php5:108

Interactivate: U

U

Calculating...

u • Show All

u (...)

union of sets

The union of two or more sets is the set of all the objects contained by at least one of the sets. The symbol for union is U

unit circle

A circle of radius 1 centered at the origin (0,0) of the Cartesian coordinate system.

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