MathPHP\Functions\Special::upperIncompleteGamma PHP Метод

    public static function upperIncompleteGamma($s, $x)
    {
        if ($s <= 0) {
            throw new Exception\OutOfBoundsException("S must be > 0. S = {$s}");
        }
        return self::gamma($s) - self::lowerIncompleteGamma($s, $x);
    }