:: deftheorem Def20 defines the_right_argument_of MODELC_2:def 20 :
for H being LTL-formula st ( H is conjunctive or H is disjunctive or H is Until or H is Release ) holds
for b₂ being LTL-formula holds
( ( H is conjunctive implies ( b₂ = the_right_argument_of H iff ex H1 being LTL-formula st H1 '&' b₂ = H ) ) & ( H is disjunctive implies ( b₂ = the_right_argument_of H iff ex H1 being LTL-formula st H1 'or' b₂ = H ) ) & ( H is Until implies ( b₂ = the_right_argument_of H iff ex H1 being LTL-formula st H1 'U' b₂ = H ) ) & ( not H is conjunctive & not H is disjunctive & not H is Until implies ( b₂ = the_right_argument_of H iff ex H1 being LTL-formula st H1 'R' b₂ = H ) ) );