At: P no dup switchable0 2
1. E: EventStruct
memorylessR(E) preserves No-dup-deliver(E)
By:
BackThru
Thm*
E:EventStruct, P:TraceProperty(E).
R_strong_safety(E) preserves P 
memorylessR(E) preserves P
THEN
Try (Unfold `trace_property` 0)
THEN
Easy
Generated subgoals:None
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