Step * 1 1 of Lemma squash-per-class


1. Type
2. [a1] Base
3. [b] Base
4. [c] a1 b ∈ T
⊢ ↓per-class(T;a1)
BY
(Unhide THEN THEN UseWitness ⌜a1⌝⋅ THEN MemTypeCD THEN Try (BLemma `equal-wf-base-T`) THEN Auto) }


Latex:


Latex:

1.  T  :  Type
2.  [a1]  :  Base
3.  [b]  :  Base
4.  [c]  :  a1  =  b
\mvdash{}  \mdownarrow{}per-class(T;a1)


By


Latex:
(Unhide  THEN  D  0  THEN  UseWitness  \mkleeneopen{}a1\mkleeneclose{}\mcdot{}  THEN  MemTypeCD  THEN  Try  (BLemma  `equal-wf-base-T`)  THEN  Auto)




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