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Step * of Lemma subtype_rel_union_right

∀[A,B:Type].  (B ⊆r (A ⋃ B))
BY
{ Auto }

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Latex:

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


By

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Latex:
Auto

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