Lars Fr. H. Svendsen: Å forstå dyr

Lars Chittka

set up to see who can catch the most. The Environment Education Foundation hosted its third ‘lionfish derby’ last month off Florida, outside the reserve, with more than $3,000 in prize money for the team catching the most fish — 109 were killed. In the waters around the Bahamas, which don’t have the same protection as Florida Keys, more than 2,000 lionfish have been killed over the past two yea...

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Graph Theory By Lars

This development provides a formalization of directed graphs, supporting (labelled) multi-edges and infinite graphs. A polymorphic edge type allows edges to be treated as pairs of vertices, if multi-edges are not required. Formalized properties are i.a. walks (and related concepts), connectedness and subgraphs and basic properties of isomorphisms. This formalization is used to prove characteriz...

Interview with Lars

LPH: As a graduate student at the University of Minnesota, I had the opportunity to take classes from Chris Sims and Tom Sargent. Both emphasized the idea that dynamic econometric models should be viewed as restrictions on stochastic processes. Sims’ classroom development of large sample econometrics broke with the more conventional view of the time of focusing on models with exogenous regresso...

Wavelength (å)

We present near-infrared (observed frame) spectra of the high-redshift quasar S4 0636+68 at z = 3.2 which was previously thought to be one of a group of “strong” Fe II emitters (i.e., F (Fe IIλλ4434–4684)/F (Hβ) > 1). Our K-band spectrum clearly shows emission lines of Hβ and [O III]λλ4959, 5007 as well as optical Fe II emission. Our computed value of F (Fe II λλ4434–4684)/F (Hβ) ≃ 0.8 for S4 0...