We describe the construction of a Lie algebra from a partial linear space with oriented lines of size 3, generalizing a construction by Kaplansky. We determine all suitable partial linear spaces and the resulting Lie algebras. 1 Lie oriented partial linear spaces A partial linear space is an incidence structure (P,L) with points and lines, such that the point-line incidence graph does not conta...

We consider a problem where a set of objects possessing multiple attributes must be partitioned into a certain number of groups so that the groups are as balanced as possible with respect to the number of objects possessing each attribute. This multi-criteria decision problem arises in a variety of practical applications, ranging from assigning students to study groups to designing level schedu...

This study demonstrates the impact of systematic risk on the prices of individual equity options. The option prices are characterized by the level and slope of implied volatility curves, and the systematic risk is measured as the proportion of systematic variance in the total variance. Using daily option quotes on the S&P 100 index and its 30 largest component stocks, we show that, after contro...

0749-5978/$ see front matter 2013 Elsevier Inc. All rights reserved. http://dx.doi.org/10.1016/j.obhdp.2013.09.001 q This research was supported by grants from the University of Toronto Joseph L. Rotman School of Management Desautels Centre for Integrative Thinking and the Social Sciences and Humanities Research Council of Canada. We thank Maria Catanzaro and Wardah Malik for running experiment...

This paper shows how analytic modeling research in the Marketing field is focused on answering questions of “How?” and “Why?” It describes the disciplines involved in analytic modeling; examines how the key criteria of parsimony and robustness help to define a good model; and discusses other Market Lett DOI 10.1007/s11002-010-9110-5 Arising from The Erin Anderson Research Conference at the Whar...

Debates on “shareholder” and “stakeholder” approaches to corporate governance often get bogged down in competing normative claims about economic rent streams, entitlements of different group members, fairness, and similar distributional issues. These concerns are important, but core economic issues in shareholder−stakeholder debates revolve around the positive analysis of property rights, trans...

purpose: to report clinical outcomes of crystalline lens extraction and iris claw artisan intraocular lens (iol) implantation in patients with lens subluxation secondary to marfan syndrome.  methods: this retrospective study enrolled 14 eyes of 12 marfan patients with lens subluxation who underwent crystalline lens removal and artisan iol implantation. pre- and post-operative data, including pa...

the purpose of this investigation was to study and compare the electrophoretic patterns of optic lensproteins of different species of domestic animals at pre- and post-natal ages. optic lenses were removed from the embryo or adult sheep, cattle, goat, camel and chicken at the slaughter-house then homogenized and subjected to sodium dodecylsulfate polyacrylamide gel electrophoresis (sds-page). i...

purpose : to assess the visual and refractive outcomes after implantation of toric implantable collamer lens (t-icl) in compound myopic astigmatism methods : in this prospective study, 28 eyes with manifest refraction spherical equivalent (mrse) errors of -10.94±4.09 diopter (d) and mean cylindrical errors of -3.47±1.39 d underwent t-icl implantation. six months after surgery, best corrected an...

purpose : cataract surgery is the most common ocular surgery worldwide and in modern era of phacoemulsification with posterior chamber intraocular lens (pc iol) implantation, refractive aspects of surgery is as important as the surgery itself. after the iol implantation, the anterior chamber depth (acd) is increased and the iridiocorneal angle is widened. these changes should be considered for ...