is mentioned by

Thm* E:EventStruct. send-enabledR(E) preserves No-dup-deliver(E)	[P_no_dup_send_enabled]
Def switchable(E)(P) == safetyR(E) preserves P & memorylessR(E) preserves P & (ternary) composableR(E) preserves P & send-enabledR(E) preserves P & asyncR(E) preserves P & delayableR(E) preserves P & (P refines Causal(E)) & (P refines No-dup-deliver(E))	[b_switchable]
Def switchable0(E)(P) == safetyR(E) preserves P & memorylessR(E) preserves P & (ternary) composableR(E) preserves P & send-enabledR(E) preserves P & asyncR(E) preserves P & delayableR(E) preserves P	[switchable0]
Def layerR(E) == ((asyncR(E) delayableR(E)) send-enabledR(E))^*	[layer_rel]

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