Step
*
of Lemma
dep-isect-subtype2
∀[A1,A2:Type]. ∀[B1:A1 ⟶ Type]. ∀[B2:A2 ⟶ Type].
(x:A1 ⋂ B1[x] ⊆r x:A2 ⋂ B2[x]) supposing ((∀x:A1. (B1[x] ⊆r B2[x])) and (A1 ⊆r A2))
BY
{ (Auto THEN (D 0 THENA Auto) THEN DepIsectHD (-1) THEN DepIsectCD THEN Auto THEN DoSubsume THEN Auto) }
Latex:
Latex:
\mforall{}[A1,A2:Type]. \mforall{}[B1:A1 {}\mrightarrow{} Type]. \mforall{}[B2:A2 {}\mrightarrow{} Type].
(x:A1 \mcap{} B1[x] \msubseteq{}r x:A2 \mcap{} B2[x]) supposing ((\mforall{}x:A1. (B1[x] \msubseteq{}r B2[x])) and (A1 \msubseteq{}r A2))
By
Latex:
(Auto THEN (D 0 THENA Auto) THEN DepIsectHD (-1) THEN DepIsectCD THEN Auto THEN DoSubsume THEN Auto)
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