fact: Definition R3 (m n : 'I_3) : bool := match m : nat, n : nat with | 0,0 => true | 0,1 => true | 1,2 => true | 2,2 => true | _,_ => false end.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert)