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Nor

Nor[e1, e2, ...]
is the logical NOR function. It evaluates its arguments in order, giving False immediately if any of them are True, and True if they are all False.
  • Nor[e1, e2, ...] is equivalent to Not[Or[e1, e2, ...]].  »
  • Nor has attribute HoldAll, and explicitly controls the evaluation of its arguments. In Nor[e1, e2, ...] the e_i are evaluated in order, stopping if any of them is found to be True.  »
  • Nor gives symbolic results when necessary, removing initial arguments that are False.
New in 4.1