Service learning enchances the college experience

Service learning is a process that is able to take what students learn in the classroom and morph that learning into something more tangible. Participation in one’s community is what more and more modern day institutions encourage their students to strive for, because service learning creates experienced and engaged individuals

Asymptotically efficient triangulations of the d-cube

Let $P$ and $Q$ be polytopes, the first of "low" dimension and the second of "high" dimension. We show how to triangulate the product $P \times Q$ efficiently (i.e., with few simplices) starting with a given triangulation of $Q$. Our method has a computational part, where we need to compute an efficient triangulation of $P \times \Delta^m$, for a (small) natural number $m$ of our choice. $\Delta^m$ denotes the $m$-simplex. Our procedure can be applied to obtain (asymptotically) efficient triangulations of the cube $I^n$: We decompose $I^n = I^k \times I^{n-k}$, for a small $k$. Then we recursively assume we have obtained an efficient triangulation of the second factor and use our method to triangulate the product. The outcome is that using $k=3$ and $m=2$, we can triangulate $I^n$ with $O(0.816^{n} n!)$ simplices, instead of the $O(0.840^{n} n!)$ achievable before.Comment: 19 pages, 6 figures. Only minor changes from previous versions, some suggested by anonymous referees. Paper accepted in "Discrete and Computational Geometry

The polytope of non-crossing graphs on a planar point set

For any finite set \A of $n$ points in $\R^2$, we define a $(3n-3)$-dimensional simple polyhedron whose face poset is isomorphic to the poset of ``non-crossing marked graphs'' with vertex set \A, where a marked graph is defined as a geometric graph together with a subset of its vertices. The poset of non-crossing graphs on \A appears as the complement of the star of a face in that polyhedron. The polyhedron has a unique maximal bounded face, of dimension $2n_i +n -3$ where $n_i$ is the number of points of \A in the interior of \conv(\A). The vertices of this polytope are all the pseudo-triangulations of \A, and the edges are flips of two types: the traditional diagonal flips (in pseudo-triangulations) and the removal or insertion of a single edge. As a by-product of our construction we prove that all pseudo-triangulations are infinitesimally rigid graphs.Comment: 28 pages, 16 figures. Main change from v1 and v2: Introduction has been reshape

Quantum authentication of classical messages

Although key distribution is arguably the most studied context on which to apply quantum cryptographic techniques, message authentication, i.e., certifying the identity of the message originator and the integrity of the message sent, can also benefit from the use of quantum resources. Classically, message authentication can be performed by techniques based on hash functions. However, the security of the resulting protocols depends on the selection of appropriate hash functions, and on the use of long authentication keys. In this paper we propose a quantum authentication procedure that, making use of just one qubit as the authentication key, allows the authentication of binary classical messages in a secure manner.Comment: LaTeX, 6 page

The Third Moment in Law and Development Theory and the Emergence of a New Critical Practice

The study of the relationship between law and economic development goes back at least to the nineteenth century. It is a question that attracted the attention of classical thinkers like Marx and Weber. And there were some early efforts to craft policy in this area; for example, under the Raj, some English Utilitarians tried to put Jeremy Bentham’s ideas about law and economic progress into practice in India. But it was only after World War II that systematic and organized efforts to reform legal systems became part of the practice of international development agencies. Initially, development agencies turned to law as an instrument for state policy aimed at generating economic growth. Starting in the 1980s, interest in the role of law in economic development grew, but it was an interest in law more as a framework for market activity than as an instrument of state power. This book argues that, starting in the mid-1990s, development practitioners approached law in a fundamentally new way – as a correction for market failures and as a constitutive part of “development” itself. As a result, “the rule of law” has become significant not only as a tool of development policy, but as an objective for development policy in its own right. This book charts the history of this growing interest in the legal field, explores the shifting rationales behind development policy initiatives, and explores in detail the newest – and most surprising – of these rationales. To do that, we trace the history of a body of ideas about law and economic development that have been employed not just by academics but also by development practitioners responsible for allocating funds and designing projects. In this introduction, we refer to that body of ideas as law and development doctrine. Although this doctrine has academic roots in economic and legal theory, it is a practical working tool of development agencies

Checklist of the Helminth Parasites of South American Bats

My Brazilian co-author paid for this paper to be open--access.Copyright © 2001-2015 Magnolia Press. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The attached file is the published version of the article

AUTOMATIC TESTS for SUPER EXOGENEITY

We develop a new automatically-computable test for super exogeneity, using a variant of general-to-specific modelling. Based on the recent developments in impulse saturation applied to marginal models under the null that no impulses matter, we select the significant impulses for testing in the conditional. The approximate analytical non-centrality of the test is derived for a failure of invariance and for a failure of weak exogeneity when there is a shift in the marginal model. Monte Carlo simulations confirm the nominal significance levels under the null, and power against the two alternatives.super exogeneity, general-to-specific, test power, indicators, cobreaking