Section DerivableRulesFromSequentCalculus.
Context {L: Language}
{Gamma: Derivable L}
{bSC: BasicSequentCalculus L Gamma}.

Lemma deduction_weaken0 {GammaP: Provable L} {SC: NormalSequentCalculus L GammaP Gamma}: forall Phi y,
|-- y ->
Phi |-- y.