Step of Proof: absval_elim 12,41

Inference at * 1 1 1 
Iof proof for Lemma absval elim:



1. P : 
2. x : 
  (P(if 0 x then x else -x fi ))  (P(x)) 
latex

 by InteriorProof ((((BoolCasesOnCExp 0 x
CollapseTHENM (AbReduce 0))
CollapseTHEN (
CollapseTHEN ((Auto_aux (first_nat 1:n) ((first_nat 2:n),(first_nat 3:n)) (first_tok :t
CollapseTHEN () inil_term))) 
latex


C.


DefinitionsT, P  Q, P & Q, P  Q, x:AB(x), True, ff, if b then t else f fi , P  Q, tt, t  T, , Unit, , False, A, A  B, ,
Lemmasassert of lt int, bnot of le int, true wf, squash wf, eqff to assert, assert of le int, eqtt to assert, iff transitivity, bnot wf, lt int wf, le wf, assert wf, bool wf, le int wf

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