Nuprl Lemma : d-sub_transitivity 0,22

D1D2D3:Dsys. D1  D2  D2  D3  D1  D3 
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DefinitionsId, t  T, x:AB(x), M1  M2, D1  D2, Dsys, P  Q, M(i)
Lemmasma-sub transitivity, d-m wf, d-sub wf, dsys wf, Id wf

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