exact Provable.var v
axs : Statement → Prop
ax : Statement
H : axs ax
fmla : Formula
h : fmla ∈ ax.ctx.hyps ∨ ∃ v, fmla = VR.vhyp v
v : VR
⊢ Provable axs ax.ctx (Formula.subst VR.expr (VR.vhyp v))
no goals