Meeting with Frank. Sketched the ideas I was working on in a bit more detail. Pointed out that MELL reduces to VCS with just one binary rule, and Frank responded that, well, higher-order unification becomes undecidable with just one binary predicate. So, yeah, lately I've been thinking that it might be undecidable. I should dig up papers on higher-order unification, undecidability of Petri Net equivalence, and decidability of affine logic.
Type systems happened. Bounded quantification is neat.
D&D: Wandered around in the cave some more. Had 8 people for JM; they had to split us up. Futzed with the OSC piano after that. Chord progression to remember: C Ab Eb G