This paper extends the notion of the Λ-coalescent of Pitman (1999) to the spatial setting. The partition elements of the spatial Λ-coalescent migrate in a (finite) geographical space and may only coalesce if located at the same site of the space. We characterize the Λ-coalescents that come down from infinity, in an analogous way to Schweinsberg (2000). Surprisingly, all spatial coalescents that...

This paper explores the concepts of synergy, economies of scope and complementary in an attempt to refine the concept of synergy. The paper develops a taxonomi consisting of four kinds of synergies: 1)The static and subadditive synergies consisting of economies of scope and asset amortization benefits, 2) the static and superadditive synergies known from the treatment by Ansoff (1965), 3) the d...

An important challenge in the streaming model is to maintain small-space approximations of entrywise functions performed on a matrix that is generated by the outer product of two vectors given as a stream. In other works, streams typically define matrices in a standard way via a sequence of updates, as in the work of Woodruff [22] and others. We describe the matrix formed by the outer product, ...

Under the continuous assumption on the generator g, Briand et al. [Electron. Comm. Probab. 5 (2000) 101–117] showed some connections between g and the conditional g-expectation (Eg[·|Ft])t∈[0,T ] and Rosazza Gianin [Insurance: Math. Econ. 39 (2006) 19–34] showed some connections between g and the corresponding dynamic risk measure (ρgt )t∈[0,T ]. In this paper we prove that, without the additio...

Work on implicit utilitarian voting advocates the design of voting rules that maximize utilitarian social welfare with respect to latent utility functions, based only on observed rankings of the alternatives. This approach has been successfully deployed in order to help people choose a single alternative or a subset of alternatives, but it has previously been unclear how to apply the same appro...

A core element of microeconomics and game theory is that consumers have valuation functions over bundles of goods and that these valuation functions drive their purchases. In particular, the value assigned to a bundle need not be the sum of values on the individual items but rather is often a more complex function of how the items relate. The literature considers a hierarchy of valuation classe...

Abstract Under the presupposition that human time perception is distorted in intertemporal choice, this study constructs a scale framework of axiomatic measurement. First, conditions (homogeneity degree one or two) to identify form are proposed so can determine whether hyperbolic exponential more suitable function for modeling people’s discounting. Homogeneity implies subjective delay measured ...