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Step * of Lemma fset-pair-is-union

∀[T:Type]. ∀[eq:EqDecider(T)]. ∀[x,y:T].  ({x,y} = {x} ⋃ {y} ∈ fset(T))
BY
{ (Auto THEN FsetExt THEN All (RWO "member-fset-pair member-fset-singleton") THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[eq:EqDecider(T)].  \mforall{}[x,y:T].    (\{x,y\}  =  \{x\}  \mcup{}  \{y\})


By

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Latex:
(Auto  THEN  FsetExt  THEN  All  (RWO  "member-fset-pair  member-fset-singleton")  THEN  Auto)

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