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Step * 2 of Lemma deq-exists


1. [T] : Type
2. x : ∀x,y:T.  Dec(x = y ∈ T)@i
⊢ EqDecider(T)
BY
{ (UseWitness ⌜mk_deq(x)⌝⋅ THEN Auto)⋅ }

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Latex:

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Latex:

1.  [T]  :  Type
2.  x  :  \mforall{}x,y:T.    Dec(x  =  y)@i
\mvdash{}  EqDecider(T)


By

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Latex:
(UseWitness  \mkleeneopen{}mk\_deq(x)\mkleeneclose{}\mcdot{}  THEN  Auto)\mcdot{}

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