Step 
*
 of Lemma 
one_or_both_ind_oobboth_lemma
∀right,left,both,bval:Top.
  (one_or_both_ind(oobboth(bval);bval.both[bval];lval.left[lval];rval.right[rval]) ~ both[bval])
BY
 
{ (UnivCD THENA Auto) }
1
1. right : Top@i
2. left : Top@i
3. both : Top@i
4. bval : Top@i
⊢ one_or_both_ind(oobboth(bval);bval.both[bval];lval.left[lval];rval.right[rval]) ~ both[bval]
 
Latex: 
Latex:
\mforall{}right,left,both,bval:Top.
    (one\_or\_both\_ind(oobboth(bval);bval.both[bval];lval.left[lval];rval.right[rval])  \msim{}  both[bval])
 By 
Latex:
(UnivCD  THENA  Auto)
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