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: [[Lepton|Anti-lepton]]s have a '''lepton number''' of -1.
: If a [[Lepton]] comes into existence an [[Lepton|Anti-lepton]] must also come into existence.
: '''Conservation of Lepton Number''' can be applied to all [[Fundamental Interactions|fundamental interactions]] to balance the [[Nuclear Equation|equations]] and to ascertain the types of [[Subatomic Particle|particles]] produced. However, [[lepton]]s do not interact via the [[Strong Nuclear Interaction]], so while the conservation law applies, it is irrelevant.
===Examples===