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Step * of Lemma itermAdd_functionality

∀[a,b,c,d:int_term()].  (a "+" c ≡ b "+" d) supposing (a ≡ b and c ≡ d)
BY
{ (Auto
   THEN RepeatFor 2 (ParallelLast)
   THEN (With ⌜f⌝ (D 5)⋅ THENA Auto)
   THEN (RepUR ``int_term_value`` 0 THEN Fold `int_term_value` 0)
   THEN Auto) }

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Latex:

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Latex:
\mforall{}[a,b,c,d:int\_term()].    (a  "+"  c  \mequiv{}  b  "+"  d)  supposing  (a  \mequiv{}  b  and  c  \mequiv{}  d)


By

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Latex:
(Auto
  THEN  RepeatFor  2  (ParallelLast)
  THEN  (With  \mkleeneopen{}f\mkleeneclose{}  (D  5)\mcdot{}  THENA  Auto)
  THEN  (RepUR  ``int\_term\_value``  0  THEN  Fold  `int\_term\_value`  0)
  THEN  Auto)

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