O znanych i mniej znanych relacjach Leonharda Eulera z Polską

In this work we focus on research contacts of Leonhard Euler with Polish scientists of his era, mainly with those from the city of Gdańsk (then Gedanum, Danzig). L. Euler was the most prolific mathematician of all times, the most outstanding mathematician of the 18th century, and one of the best ever. The complete edition of his manuscripts is still in process (Kleinert 2015; Kleinert, Mattmüller 2007).Euler’s contacts with French, German, Russian, and Swiss scientists have been widely known, while relations with Poland, then one of the largest European countries, are still in oblivion. Euler visited Poland only once, in June of 1766, on his way back from Berlin to St. Petersburg. He was hosted for ten days in Warsaw by Stanisław II August Poniatowski, the last king of Poland. Many Polish scientists were introduced to Euler, not only from mathematical circles, but also astronomers and geographers. The correspondence of Euler with Gdańsk scientists and officials, including Carl L. Ehler, Heinrich Kühn and Nathanael M. von Wolf, originated already in the mid-1730s. We highlight the relations of L. Euler with H. Kühn, a professor of mathematics at the Danzig Academic Gymnasium and arguably the best Polish mathematician of his era. It was H. Kühn from whom Euler learned about the Königsberg Bridge Problem; hence one can argue that the beginning of the graph theory and topology of the plane originated in Gdańsk. In addition, H. Kühn was the first mathematician who proposed a geometric interpretation of complex numbers, the theme very much appreciated by Euler.Findings included in this paper are either unknown or little known to a general mathematical community.W tej pracy skupiamy się na kontaktach badawczych Leonharda Eulera z polskimi naukowcami jego epoki, głównie z Gdańska (wtedy Gedanum, Danzig). L. Euler był najbardziej płodnym matematykiem wszystkich czasów, najwybitniejszym matematykiem osiemnastego wieku i jednym z najlepszych w historii. Kompletne wydanie jego rękopisów nie zostało dotąd zakoń- czone (Kleinert 2015; Kleinert, Mattmüller 2007).Kontakty Eulera z francuskimi, niemieckimi, rosyjskimi i szwajcarskimi naukowcami są powszechnie znane, a stosunki z Polską, wtedy jednym z największych krajów europejskich, są nadal zapomniane. Euler odwiedził Polskę tylko raz, w czerwcu 1766 roku, w drodze powrotnej z Berlina do Petersburga.Ostatni król Polski Stanisław August poniatowski gościł Eulera w Warszawie przez dziesięć dni. Wielu polskich naukowców przedstawiono Eulerowi, nie tylko z kręgów matematycznych, ale również astronomów i geografów. Korespondencja Eulera z gdańskimi naukowcami i urzędnikami, w tym Carlem L. Ehlerem, Heinrichem Kühnem i Natanaelem M. von Wolfem zaczęła się już w połowie lat 30. XVIII wieku. Wyróżniamy relacje L. Eulera z H. Kühnem, profesorem matematyki w Gimnazjum Akademickim w Gdańsku i prawdopodobnie najlepszym polskim matematykiem tamtej epoki. To od H. Kühna Euler dowiedział się o problemie mostów królewieckich. Dlatego można argumentować, że początek teorii grafów i topologii płaszczyzny wywodzi się z Gdańska. Ponadto, H. Kühn był pierwszym matematykiem, który zaproponował interpretację geometryczną liczb zespolonych, bardzo cenioną przez Eulera.Ustalenia zawarte w niniejszym artykule są albo nieznane lub mało znane ogólnej społeczności matematyków

The prominence of Danzig Academic Gymnasium as a cornerstone of scientific developments in Gdańsk

The Danzig Academic Gymnasium (1558–1817) was one of the first Protestant schools at the college level in the Polish-Lithuanian Commonwealth. It became one of the most famous educational institutions in Europe of the 16–18th centuries. For almost 260 years, it attracted one of the best professors and students of the era. We concentrate on the achievements in science, the role of the City Council Library in the academic life in and outside of the Gymnasium, and highlight the activities of the Danzig Naturalist Society. In this survey, we feature important representatives of the scientific disciplines present in the Gymnasium, both faculty and their students, as well as Gdańsk scientists in general. We outline the lasting impact of the Danzig Academic Gymnasium on the intellectual life in Gdańsk, the Pomerania region, and some intellectual circles in Europe

Uzupeƚnienie artykuƚu ‘On known and less known relations of Leonhard Euler with Poland’ (DOI: 10.4467/23921749SHS.16.005.6148)

In this note we publish a short letter from Leonhard Euler’s son, Johann Albrecht Euler, the Secretary of the Imperial Academy in St. Petersburg, to Marcin Poczobutt-Odlanicki, the Vilnius astronomer. The fate of this letter seemed unknown, but we know its content now. The main news in this correspondence was the discovery of a comet by the astronomer Anders Johan Lexell.W tej nocie publikujemy krótki list Johanna Albrechta Eulera, sekretarza Rosyjskiej Akademii Nauk w St. Petersburgu do Marcina Poczobutta-Odlanickiego, astronoma wileńskiego. Los tego listu wydawaƚ się być nieznany, ale obecnie zostaƚ list ten zostaƚ zlokalizowany. Dokƚadnie znamy jego treść, której zasadniczą cześć stanowi informacja o odkryciu nowej komety przez astronoma Andersa Johana Lexella

Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV

Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript −1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

Optimasi Portofolio Resiko Menggunakan Model Markowitz MVO Dikaitkan dengan Keterbatasan Manusia dalam Memprediksi Masa Depan dalam Perspektif Al-Qur`an

Risk portfolio on modern finance has become increasingly technical, requiring the use of sophisticated mathematical tools in both research and practice. Since companies cannot insure themselves completely against risk, as human incompetence in predicting the future precisely that written in Al-Quran surah Luqman verse 34, they have to manage it to yield an optimal portfolio. The objective here is to minimize the variance among all portfolios, or alternatively, to maximize expected return among all portfolios that has at least a certain expected return. Furthermore, this study focuses on optimizing risk portfolio so called Markowitz MVO (Mean-Variance Optimization). Some theoretical frameworks for analysis are arithmetic mean, geometric mean, variance, covariance, linear programming, and quadratic programming. Moreover, finding a minimum variance portfolio produces a convex quadratic programming, that is minimizing the objective function ðð¥with constraintsð ð 𥠥 ðandð´ð¥ = ð. The outcome of this research is the solution of optimal risk portofolio in some investments that could be finished smoothly using MATLAB R2007b software together with its graphic analysis

Juxtaposing BTE and ATE – on the role of the European insurance industry in funding civil litigation

One of the ways in which legal services are financed, and indeed shaped, is through private insurance arrangement. Two contrasting types of legal expenses insurance contracts (LEI) seem to dominate in Europe: before the event (BTE) and after the event (ATE) legal expenses insurance. Notwithstanding institutional differences between different legal systems, BTE and ATE insurance arrangements may be instrumental if government policy is geared towards strengthening a market-oriented system of financing access to justice for individuals and business. At the same time, emphasizing the role of a private industry as a keeper of the gates to justice raises issues of accountability and transparency, not readily reconcilable with demands of competition. Moreover, multiple actors (clients, lawyers, courts, insurers) are involved, causing behavioural dynamics which are not easily predicted or influenced. Against this background, this paper looks into BTE and ATE arrangements by analysing the particularities of BTE and ATE arrangements currently available in some European jurisdictions and by painting a picture of their respective markets and legal contexts. This allows for some reflection on the performance of BTE and ATE providers as both financiers and keepers. Two issues emerge from the analysis that are worthy of some further reflection. Firstly, there is the problematic long-term sustainability of some ATE products. Secondly, the challenges faced by policymakers that would like to nudge consumers into voluntarily taking out BTE LEI

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good

Search for stop and higgsino production using diphoton Higgs boson decays

Results are presented of a search for a "natural" supersymmetry scenario with gauge mediated symmetry breaking. It is assumed that only the supersymmetric partners of the top-quark (stop) and the Higgs boson (higgsino) are accessible. Events are examined in which there are two photons forming a Higgs boson candidate, and at least two b-quark jets. In 19.7 inverse femtobarns of proton-proton collision data at sqrt(s) = 8 TeV, recorded in the CMS experiment, no evidence of a signal is found and lower limits at the 95% confidence level are set, excluding the stop mass below 360 to 410 GeV, depending on the higgsino mass