public static function convertFromRoman( $roman )
	{
		Deprecation::getInstance()
			->setErrorVersion( '0.8.5' )
			->setExceptionVersion( '0.9' )
			->message( sprintf(
				'Please use %s (%s) instead',
				'public library "CeusMedia/Math"',
			 	'https://packagist.org/packages/ceus-media/math'
			) );
		$_r = str_replace( array_keys( $this->roman ), "", $roman );						//  prove roman number by clearing all valid numbers
		if( strlen( $_r ) )																	//  some numbers are invalid
			throw new InvalidArgumentException( "Roman '".$roman."' is invalid." );
		$integer = 0;																		//  initiating integer
		$keys	= array_keys( $this->shorts );
		$values	= array_values( $this->shorts );
		$roman = str_replace( $values, $keys, $roman );										//  resolve shortcuts
		foreach( $this->roman as $key => $value )											//  all roman number starting with biggest
		{
			$count = substr_count( $roman, $key );											//  amount of roman numbers of current value
			$integer += $count * $value;													//  increase integer by amount * current value
			$roman = str_replace( $key, "", $roman );											//  remove current roman numbers
		}
		return $integer;
	}