let H1, H2 be LTL-formula; :: thesis: for V being LTLModel
for Kai being Function of atomic_LTL, the BasicAssign of V holds Evaluate ((H1 'or' H2),Kai) = (Evaluate (H1,Kai)) 'or' (Evaluate (H2,Kai))
let V be LTLModel; :: thesis: for Kai being Function of atomic_LTL, the BasicAssign of V holds Evaluate ((H1 'or' H2),Kai) = (Evaluate (H1,Kai)) 'or' (Evaluate (H2,Kai))
let Kai be Function of atomic_LTL, the BasicAssign of V; :: thesis: Evaluate ((H1 'or' H2),Kai) = (Evaluate (H1,Kai)) 'or' (Evaluate (H2,Kai))
consider f0 being Function of LTL_WFF, the carrier of V such that
A1: f0 is-Evaluation-for Kai and
A2: Evaluate ((H1 'or' H2),Kai) = f0 . (H1 'or' H2) by Def35;
consider f1 being Function of LTL_WFF, the carrier of V such that
A3: f1 is-Evaluation-for Kai and
A4: Evaluate (H1,Kai) = f1 . H1 by Def35;
consider f2 being Function of LTL_WFF, the carrier of V such that
A5: f2 is-Evaluation-for Kai and
A6: Evaluate (H2,Kai) = f2 . H2 by Def35;
A7: f0 = f2 by A1, A5, Th49;
A8: H1 'or' H2 is disjunctive ;
then A9: ( the_left_argument_of (H1 'or' H2) = H1 & the_right_argument_of (H1 'or' H2) = H2 ) by Def19, Def20;
f0 = f1 by A1, A3, Th49;
hence Evaluate ((H1 'or' H2),Kai) = (Evaluate (H1,Kai)) 'or' (Evaluate (H2,Kai)) by A1, A2, A4, A6, A7, A8, A9; :: thesis: verum