Step
*
of Lemma
null-bag-empty
∀T:Type. ∀x:bag(T). (↑bag-null(x)
⇐⇒ x = {} ∈ bag(T))
BY
{ (((UnivCD THENA Auto) THEN Unfold `bag-null` 0 THEN RWO "null-bag" 0) THEN Auto) }
Latex:
Latex:
\mforall{}T:Type. \mforall{}x:bag(T). (\muparrow{}bag-null(x) \mLeftarrow{}{}\mRightarrow{} x = \{\})
By
Latex:
(((UnivCD THENA Auto) THEN Unfold `bag-null` 0 THEN RWO "null-bag" 0) THEN Auto)
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