Thursday, 27 February 2014, 14:00
Cybernetica Bldg (Akadeemia tee 21), room B101
Abstract: I refine a dependent type theory with a system of "worlds" that say "where" things are, separately from what they are. Worlds are preordered by "accessibility", with the variable rule ensuring that information flows only in accordance. Any upward-closed set of worlds admits a Church-to-Curry-style erasure. I'll discuss a variety of situations which might be modelled by worldly type systems, not least the indexing of algebraic effects.