Yang–Lee circle theorem was extended to an ideal homogeneous pseudospin-1/2 Bose gas in an external magnetic field [X.Z. Wang, Phys. Rev. E 63 (2001) 046103]. In this paper, the theorem is extended to the case with an arbitrary external potential. The densities of zeros for several cases are...

We present a well-defined generalisation of the core to coalitional games with externalities, where the value of a deviation is given by an endogenous response, the solution (if nonempty: the core) of the residual game. Copyright Springer Science+Business Media, LLC 2007

This paper provides a methodology to study coalition formation problems with externalities and heterogeneous players, when some subset of the players can act as “coalition developers” over time. The framework provided here allows to explicitly predict the timing of admission to coalitions,...