A study of set-sharing analysis via cliques

We study the problem of efficient, scalable set-sharing analysis of logic programs. We use the idea of representing sharing information as a pair of abstract substitutions, one of which is a worst-case sharing representation called a clique set, which was previously proposed for the case of inferring pair-sharing. We use the clique-set representation for (1) inferring actual set-sharing information, and (2) analysis within a top-down framework. In particular, we define the abstract functions required by standard top-down analyses, both for sharing alone and also for the case of including freeness in addition to sharing. Our experimental evaluation supports the conclusion that, for inferring set-sharing, as it was the case for inferring pair-sharing, precision losses are limited, while useful efficiency gains are obtained. At the limit, the clique-set representation allowed analyzing some programs that exceeded memory capacity using classical sharing representations.Comment: 15 pages, 0 figure

A note on the coincidence between Stackelberg and Nash equilibria in a differential game between government and firms

In Navas and Mar n-Solano (2008) the coincidence between Nash and Stackelberg equilibria for a modified version of the differential game model first proposed by Lancaster (1973) was proved. However, important restrictions on the value of the parameters of the model were included, in order to obtain an interior solution. In this paper we extend the previous result, in the limit when the discount rate is equal to zero, by eliminating the restrictions and taking into account corner solutions.optimal profit taxation, nash/stackelberg equilibria, time consistency

User cost of capital with delayed investment grants

The usual assumption when considering investment grants is that grant payments are automatic when investments are undertaken. However, evidence from case studies shows that there can exist some time lag until funds are received by granted firms. In this paper the effects of delays in grant payments on the optimal investment policy of the firm are analyzed. It is shown how these delays lead not only to a higher financing cost but to an effective reduction in the investment grant rate, and in some cases, how benefits from investment grants could be canceled due to interactions with tax effects.user cost of capital, delayed grant payments

A comment on the cost of capital for investments with non-homogeneous components

In this paper, the expression for the cost of capital is derived when net and replacement investments exhibit differences in their effective prices due to a different fiscal treatment. It is shown that, contrary to previous results in the literature, the cost of capital should be constructed under an opportunity cost criterion rather than a historical one. This result has some important economic consequences, since the optimizing firm will take into account not only the effective price for the new investments but also consider the opportunity cost of replacing them.grants on net investments, cost of capital

Non-constant discounting in finite horizon: The free terminal time case

This paper derives the HJB (Hamilton-Jacobi-Bellman) equation for sophisticated agents in a finite horizon dynamic optimization problem with non-constant discounting in a continuous setting, by using a dynamic programming approach. A simple example is used in order to illustrate the applicability of this HJB equation, by suggesting a method for constructing the subgame perfect equilibrium solution to the problem. Conditions for the observational equivalence with an associated problem with constant discounting are analyzed. Special attention is paid to the case of free terminal time. Strotzs model (an eating cake problem of a nonrenewable resource with non-constant discounting) is revisited.naive and sophisticated agents, observational equivalence, non-constant discounting, free terminal time

La vida silvestre: patrimonio nacional : conferencia pronunciada en la Sociedad Científica Argentina. Sesión pública del 20 de Octubre de 1970

Fil: Navas, Jorge R.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentin

Aves nuevas o poco comunes de la Patagonia

Fil: Navas, Jorge R.. Museo Argentino de Ciencias Naturales. CABA; Argentin

The wildlife: a national heritage

En la presente comunicación el autor muestra las distintas formas en que se atenta contra los recursos naturales y plantea la necesidad de una toma de conciencia para su cuidado.El documento se encuentra en español e inglésAcademia Nacional de Agronomía y Veterinari