C. Fiorentini, All intermediate logics with extra axioms in one variable, except eight, are not strongly omega-complete, J SYMB LOG, 65(4), 2000, pp. 1576-1604
In [8] it is proved that all the immediate logics axiomatizable by formulas
in one variable. except four of them, are not strongly complete. We consid
erably improve this result by showing that all the intermediate logics axio
matizable by formulas in one variable, except eight of them, are not strong
ly omega -complete. Thus. a definitive classification of such logics with r
espect to the notions of canonicity, strong completeness, omega -canonicity
and strong omega -completeness is given.