The additions (+∞) + (−∞), (−∞) + (+∞) and equivalent subtractions (+∞) − (+∞) and (−∞) − (−∞).
جمع (+∞) + (−∞)، (−∞) + (+∞) و تفریق (+∞) − (+∞) و (−∞) − (−∞).