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Step * of Lemma subtype_rel_b-union-left

∀[A,B:Type].  (A ⊆r (A ⋃ B))
BY
{ (Auto THEN At ⌜Type⌝ (D 0)⋅ THEN Auto THEN BUnionLeft THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:Type].    (A  \msubseteq{}r  (A  \mcup{}  B))


By

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Latex:
(Auto  THEN  At  \mkleeneopen{}Type\mkleeneclose{}  (D  0)\mcdot{}  THEN  Auto  THEN  BUnionLeft  THEN  Auto)

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