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Step * of Lemma context-subset-subtype-or

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∀[Gamma:j⊢]. ∀[phi1,phi2:{Gamma ⊢ _:𝔽}].  ({Gamma, (phi1 ∨ phi2) ⊢ _} ⊆r {Gamma, phi1 ⊢ _})
BY
{ (Intros THEN BLemma `context-subset-subtype` THEN Auto) }

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Latex:

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Latex:
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\mforall{}[Gamma:j\mvdash{}].  \mforall{}[phi1,phi2:\{Gamma  \mvdash{}  \_:\mBbbF{}\}].    (\{Gamma,  (phi1  \mvee{}  phi2)  \mvdash{}  \_\}  \msubseteq{}r  \{Gamma,  phi1  \mvdash{}  \_\})


By

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Latex:
(Intros  THEN  BLemma  `context-subset-subtype`  THEN  Auto)

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