An individual assessing a risky job can be understood as a public good. He and each of his valued relationships place a demand for the preservation of his life and health for which he accepts a responsibility to preserve. Additional demands generally do not deplete his capacity for beneficial relationships, hence, they are nonrival. It follows that the more extensive are his relationships the g...

When Pat Suppes asked if I would be willing to take part in a panel on norms and their conflicts last year, I asked him what he had in mind—what did he mean by a norm, and what kinds of conflicts among norms did he hope the panelists would discuss? Pat said that he preferred to let the panelists interpret the topic as they saw fit. So let me begin by offering an interpretation of the topic—of t...

An automaton is universal if it accepts every possible input. We study the notion of u-universality, which asserts that the automaton accepts every input starting with u. Universality and u-universality are both EXPTIME-hard for non-deterministic tree automata. We propose efficient antichain-based techniques to address these problems for visibly pushdown automata operating on trees. One of our ...

This paper studies a decentralized job market model where firms (academic departments) propose sequentially a (unique) position to some workers (Ph.D. candidates). Successful candidates then decide whether to accept the offers, and departments whose positions remain unfilled propose to other candidates. We distinguish between several cases, depending on whether agents’ actions are simultaneous ...

While referee #1 express some interest in the study, I am afraid that the other two referees are not persuaded that the analysis is well suited for publication here. Referee #2 finds that further definitive insight into the identity and regulation of the protease responsible for TGFalpha cleavage is needed. Referee #3 while appreciating that the findings extend previous work, s/he is also not p...