Appreciation

My father is sitting at the breakfasttable, his left hand raises by degrees a cupof coffee to his lips, his right hand firmlygrips the most important part of his morningmeal-the newspaper. Suddenly, theleft hand goes sharply down, making thechina cup click as it hits the saucer, thesports\u27 page is enlightening this morning. By God, Galento\u27s going to try itagain! Tonight at 8: 30! My father issuesthis announcement as fervently as a revivalpreacher heralds the end of the World. Who is Galento? says my mothervery innocently from her side of the table.The sports\u27 page is now dropped! My father\u27seyebrows make question marks, andhe sits up, pompous and worldly-wise,saying in a deep voice, Now Beth, you know who Galento is! No, I do not! My naive mama insists. Well, how can you live and breathewithout hearing about Galento? He\u27s theguy Joe beat before! Now he\u27s got thenerve to challenge the Brown Bomberagain

Guest Editorial: Methodological Issues in Longitudinal Analyses of Criminal Violence

This editorial introduces the IJCV Focus Section on Methodological Issues in Longitudinal Analyses of Criminal Violence. Longitudinal designs offer distinctive advantages for purposes of making causal inferences with observational data, but significant challenges must be confronted as well.  The purpose of this editorial is to highlight some of the more important methodological issues that arise in longitudinal analyses, describe in general terms selected approaches for dealing with them, and indicate ways in which the papers included in this focus section skilfully apply methodological techniques for longitudinal analyses to address substantively important issues pertaining to criminal violence

Simple Confession / words by F. Thome

Key of D. Cover: a drawing of little girl whispering in a little boys ear; Publisher: M.D. Swisher (Philadelphia)https://egrove.olemiss.edu/sharris_b/1083/thumbnail.jp

Unit shapes and a wealth of calculus problems

For a given family of similar shapes, what we call a \unit shape strongly analogizes the role of the unit circle within the family of all circles. Within many such families of similar shapes, we present what we believe is naturally and intrinsically unital about their unit shapes. We present a number of calculus problems related to extremal questions about collections of unit shapes, and we recapitulate some isoperimetric problems in terms of unit shapes. We close by presenting some problems (some of which are open) and by proffering perhaps a new perspective on the pi vs. t debate

Advanced superconducting magnets investigation

Mathematical models for steady state behavior of composite superconductors and experimental verification using magnet coi

Solving an open problem about the G-Drazin partial order

[EN] G-Drazin inverses and the G-Drazin partial order for square matrices have been both recently introduced by Wang and Liu. They proved the following implication: If A is below B under the G-Drazin partial order, then any G-Drazin inverse of B is also a G-Drazin inverse of A. However, this necessary condition could not be stated as a characterization and the validity (or not) of the converse implication was posed as an open problem. In this paper, this problem is completely solved. It is obtained that the converse, in general, is false, and a form to construct counterexamples is provided. It is also proved that the converse holds under an additional condition (which is also necessary) as well as for some special cases of matrices.Partially supported by Universidad Nacional de Río Cuarto (Grant PPI 18/C472), CONICET (Grant PIP 112-201501-00433CO), and by ANPCyT (Grant PICT 2018-03492) Partially supported by Universidad Nacional de La Pampa, Facultad de Ingeniería (Grant Resol. Nro. 155/14) Partially supported by Ministerio de Economía, Industria y Competitividad of Spain (Grant Red de Excelencia MTM2017-90682-REDT), and by Universidad Nacional del Sur of Argentina (Grant 24/L108)Ferreyra, DE.; Lattanzi, M.; Levis, FE.; Thome, N. (2020). Solving an open problem about the G-Drazin partial order. The Electronic Journal of Linear Algebra. 36:55-66. http://hdl.handle.net/10251/161871S55663