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Step * 3 of Lemma length-append

.....antecedent..... 
1. bs : Base
2. as : Base
⊢ ||bs|| ~ 0 + ||bs||
BY
{ (RWO "zero-add-base" 0 THEN Auto THEN InstLemma `length-wf-has-value` [⌜bs⌝]⋅ THEN Auto) }

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Latex:

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Latex:
.....antecedent..... 
1.  bs  :  Base
2.  as  :  Base
\mvdash{}  ||bs||  \msim{}  0  +  ||bs||


By

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Latex:
(RWO  "zero-add-base"  0  THEN  Auto  THEN  InstLemma  `length-wf-has-value`  [\mkleeneopen{}bs\mkleeneclose{}]\mcdot{}  THEN  Auto)

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