Hyperbolic systems with analytic coefficients : well-posedness of the Cauchy problem / Tatsuo Nishitani

• Record Nr.: UNISALENTO991003324909707536
• Autore: Nishitani, Tatsuo
• ISBN: 9783319022727 (pbk.)
• Descrizione fisica: viii, 237 p. : ill. ; 24 cm
• Collana: Lecture notes in mathematics, 0075-8434 ; 2097
• Classificazione: AMS 35L45; AMS 35L40; AMS 35L55
• Disciplina: 515.35
• Soggetti: Cauchy problem; Differential equations, Hyperbolic
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di bibliografia: Includes bibliographical references and index
• Nota di contenuto: Necessary conditions for strong hyperbolicity ; Two by two systems with two independent variables ; Systems with nondegenerate characteristics
• Sommario/riassunto: This monograph focuses on the well-posedness of the Cauchy problem for linear hyperbolic systems with matrix coefficients. Mainly two questions are discussed: (A) Under which conditions on lower order terms is the Cauchy problem well posed? (B) When is the Cauchy problem well posed for any lower order term? For first order two by two systems with two independent variables with real analytic coefficients, we present complete answers for both (A) and (B). For first order systems with real analytic coefficients we prove general necessary conditions for question (B) in terms of minors of the principal symbols. With regard to sufficient conditions for (B), we introduce hyperbolic systems with nondegenerate characteristics, which contains strictly hyperbolic systems, and prove that the Cauchy problem for hyperbolic systems with nondegenerate characteristics is well posed for any lower order term. We also prove that any hyperbolic system which is close to a hyperbolic system with a nondegenerate characteristic of multiple order has a nondegenerate characteristic of the same order nearby

If it ain't broke, break it : how corporate journalism killed the Arkansas gazette / / Donna Lampkin Stephens

• Record Nr.: UNINA9910972072903321
• Autore: Stephens Donna Lampkin
• Pubbl/distr/stampa: Fayetteville, Arkansas : , : University of Arkansas Press, , 2015; ©2015
• ISBN: 9781610755610; 1610755618
• Edizione: [1st ed.]
• Descrizione fisica: 1 online resource (293 p.)
• Disciplina: 070.172
• Soggetti: Newspapers - Ownership
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Based on the author's dissertation (Ph.D.--University of Southern Mississippi, 2012).
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: Introduction -- 1902-1946: early Heiskell family ownership -- 1947-1959: a new triumvirate takes control: J.N. Heiskell, Hugh B. Patterson, and Harry S. Ashmore face the crisis at Central High -- 1960-1970: the aftermath of Central High -- 1970-1974: Mr. Heiskell's death and the transition of ownership to the Patterson family -- 1974-1986: a change atop the Arkansas Democrat, the ensuing newspaper war, antitrust lawsuit, and sale to Gannett -- 1986-1990: Gannett ownership -- 1991: the death of the newspaper -- Lessons learned.
• Sommario/riassunto: The Arkansas Gazette, under the independent local ownership of the Heiskell/Patterson family, was one of the most honored newspapers of twentieth-century American journalism, winning two Pulitzer Prizes for its coverage of the Little Rock Central Crisis. But wounds from a fierce newspaper war against another local owner-Walter Hussman and his Arkansas Democrat -combined with changing economic realities, led to the family's decision to sell to the Gannett Corporation in 1986.Whereas the Heiskell/Patterson family had been committed to quality journalism, Gannett was focused on the bottom line. The corporation shifted the Gazette's editorial focus from giving readers what they needed to be engaged citizens to informing them about what they should do in their leisure time. While in many ways the chain trivialized the Gazette's mission, the paper managed to retain its superior quality. ; But financial concerns made the difference in Arkansas's ongoing newspaper war. As the head of a privately held company, Hussman had only himself to answer to, and he never flinched while spending $42 million in his battle with the Pattersons and millions more against Gannett. Gannett ultimately lost $108 million during its five years in Little Rock; Hussman said his losses were far less but still in the tens of millions.Gannett had to answer to nervous stockholders, most of whom had no tie to, or knowledge of, Arkansas or the Gazette. For Hussman, the Arkansan, the battle had been personal since at least 1978. It is no surprise that the corporation blinked first, and the Arkansas Gazette died on October 18, 1991, the victim of corporate journalism.