Step
*
of Lemma
setsubset_transitivity
∀a,b,c:coSet{i:l}. ((a ⊆ b)
⇒ (b ⊆ c)
⇒ (a ⊆ c))
BY
{ (RepeatFor 3 (Intro) THEN RWO "setsubset-iff" 0 THEN Auto) }
Latex:
Latex:
\mforall{}a,b,c:coSet\{i:l\}. ((a \msubseteq{} b) {}\mRightarrow{} (b \msubseteq{} c) {}\mRightarrow{} (a \msubseteq{} c))
By
Latex:
(RepeatFor 3 (Intro) THEN RWO "setsubset-iff" 0 THEN Auto)
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