public function gcdm( $args )
	 {
		if( count( $args ) )
		{
			$min = $this->min( $args );
			for( $i=$min; $i>0; $i-- )
			{
				$a = true;
				foreach( $args as $arg )
					if( $arg % $i != 0 )
						$a = false;
				if( $a )
					return $i;
			}
		}
		return false;
	}