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Step * 1 of Lemma atom_subtype_base

.....subterm..... T:t
1:n
1. x : Atom@i
⊢ x ∈ Base
BY
{ (Unfold `member` 0 THEN Refine `baseAtom` [] THEN Auto) }

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Latex:

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Latex:
.....subterm.....  T:t
1:n
1.  x  :  Atom@i
\mvdash{}  x  \mmember{}  Base


By

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Latex:
(Unfold  `member`  0  THEN  Refine  `baseAtom`  []  THEN  Auto)

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