| | Conferences / Symposia > Workshops : Japan Advanced Institute of Science and Technology, The 21st Century COE Program (Site not responding. Last check: ) |
 | | The interest of this variety comes from the fact that it gives a simultaneous treatment of the algebraic counterparts of modal logics and superintuitionistic logics, i.e., both the lattice of subvarieties of modal algebras and the lattice of subvarieties of Heyting algebras are complete sublattices of the lattice of varieties of weak Heyting algebras. |
 | | We will show that completeness with respect to discrete frames is equivalent to many other, seemingly unrelated properties like certain form of algebraic completeness, admissibility of some non-standard rules or conservativity of so-called minimal hybrid extensions. |
 | | Products of modal logics were introduced in the 1970s and have been intensively studied ever since. |
| www.jaist.ac.jp /jaist-coe/eng/conferences/workshop_list/20041018_modal_sbstlogics.html (923 words) |