Section DerivableRulesFromSequentCalculus.
Context {L: Language}
{GammaD: Derivable L}
{bSC: BasicSequentCalculus L GammaD}.
Context {minL: MinimumLanguage L}
{minSC: MinimumSequentCalculus L GammaD}.

Lemma deduction_impp_arg_switch: forall (Phi: context) (x y z: expr),
Phi |-- x --> y --> z ->
Phi |-- y --> x --> z.