Section DerivableRulesFromSequentCalculus.
Context {L: Language}
{Gamma: ProofTheory L}
{bSC: BasicSequentCalculus L Gamma}.
Context {minL: MinimunLanguage L}
{minSC: MinimunSequentCalculus L Gamma}.

Lemma derivable_axiom2: forall (Phi: context) (x y z: expr),
Phi |-- (x --> y --> z) --> (x --> y) --> (x --> z).