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Step * 1 of Lemma s-tl_wf


1. A : Type
2. s : stream(A)
⊢ snd(s) ∈ stream(A)
BY
{ ((Assert s ∈ A × stream(A) BY ((InstLemma `stream-ext` [⌜A⌝]⋅ THENM D -1) THEN Auto)) THEN Auto) }

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Latex:

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Latex:

1.  A  :  Type
2.  s  :  stream(A)
\mvdash{}  snd(s)  \mmember{}  stream(A)


By

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Latex:
((Assert  s  \mmember{}  A  \mtimes{}  stream(A)  BY  ((InstLemma  `stream-ext`  [\mkleeneopen{}A\mkleeneclose{}]\mcdot{}  THENM  D  -1)  THEN  Auto))  THEN  Auto)

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