KnowraExtended real number lineLinked fromLinked fromThe 3 pages that link to Extended real number line, each with the reason it gives.All 3Broader topic 1Related 1Compared with 1InfinityBroader topic: This construction treats infinity as a useful limit value, not an ordinary real number.Division by zeroCompared with: This system sometimes assigns infinite limits near zero, but does not make ordinary division by zero defined.Infimum and supremumRelated: Adjoining infinities lets unbounded sets have extended suprema or infima.