(* Author: Asta Halkjær From, DTU Compute, 2019-2021 Contributors: Alexander Birch Jensen, Anders Schlichtkrull & Jørgen Villadsen See also the Natural Deduction Assistant (NaDeA) and the Sequent Calculus Verifier (SeCaV): https://nadea.compute.dtu.dk/ https://secav.compute.dtu.dk/ *) section ‹Common Notation› theory Common imports "FOL-Fitting.FOL_Fitting" begin notation FF (‹⊥›) notation TT (‹⊤›) end