Formal proof method for predicate logics

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I am looking for the official name for a proof method, The method consists of proving the INconsistency of a theory. This was done using trees. We call it classic-elimination method but I don't know if it is the "official" name.

Does someone know?

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I am guessing you are looking for Truth Trees or Semantic Tableaux

(same method ... different names)

Here is a nice website that creates the trees automatically ... unfortunately it does not have identity.