End Executions.
Section FineGrainedExecutions.
Context
{Sem : Semantics}
{initU : seq.seq nat}
{SemAx : CoreLanguage.SemAxioms}.
Existing Instance dryResources.
Existing Instance HybridFineMachine.scheduler.
Existing Instance OrdinalPool.OrdinalThreadPool.
Existing Instance DryHybridMachineSig.
Existing Instance FineDilMem.
Existing Instance dryFineMach.

Lemma multi_step_valid_block:
forall U tr tp m U' tr' tp' m' b
(Hexec: multi_step (U, tr, tp) m (U', tr', tp') m')
(Hvalid: Mem.valid_block m b),
Mem.valid_block m' b.