Extremal copositive matrices with minimal zero supports of cardinality two

Let $A \in {\cal C}^n$ be an extremal copositive matrix with unit diagonal. Then the minimal zeros of $A$ all have supports of cardinality two if and only if the elements of $A$ are all from the set $\{-1,0,1\}$. Thus the extremal copositive matrices with minimal zero supports of cardinality two are exactly those matrices which can be obtained by diagonal scaling from the extremal $\{-1,0,1\}$ unit diagonal matrices characterized by Hoffman and Pereira in 1973.Comment: 4 page

Boston University Symphony Orchestra: Parents Weekend, February 8, 1969

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Civil Society and Political Transition in Africa

A civil society is a truly international idea. This paper argues that there is prima facie evidence of a nascent civil society in certain African countries. But universal ideas require adaptation to take into account the distinctiveness of different world regions, notably in the level of socioeconomic development, and in the cultural attributes of different nations and sub-nations

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This is the concert program of the Fall Fringe Festival, The Village Singer performance on Friday - Sunday, November 20 - 22, 1998 at 7:00 p.m., at Studio 210, Boston University Theater, 264 Huntington Avenue. The work performed was The Village Singer by Stephen Paulus. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund

Boston University Symphony Orchestra, October 29, 1989

This is the concert program of Boston University Symphony Orchestra performance on Sunday, October 29, 1989 at 8:00 p.m., at the Tsai Performance Center, 685 Commonwealth Avenue, Boston, Massachusetts. Works performed were Symphony No. 4 in B-flat, Op. 60 by Ludwig van Beethoven, Diotima by John Harbison, and Prelude and Liebestod from Tristan und Isolde by Richard Wagner. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund

Transitioning Between Audience and Performer: Co-Designing Interactive Music Performances with Children

Live interactions have the potential to meaningfully engage audiences during musical performances, and modern technologies promise unique ways to facilitate these interactions. This work presents findings from three co-design sessions with children that investigated how audiences might want to interact with live music performances, including design considerations and opportunities. Findings from these sessions also formed a Spectrum of Audience Interactivity in live musical performances, outlining ways to encourage interactivity in music performances from the child perspective

Post Penicillin Antibiotics: From acceptance to resistance?

Edited transcript of a Witness Seminar held at the Wellcome Institute for the History of Medicine, in London, on 12 May 1998. First published by the Wellcome Trust, 2000. ©The Trustee of the Wellcome Trust, London, 2000. All volumes are freely available at www.history.qmul.ac.uk/research/modbiomed/wellcome_witnesses/Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.The introduction of penicillin during the Second World War led to a revolution in both drug development and therapeutics. Several important themes emerged during the course of the meeting – the discovery of the antimicrobial effects of actinomycetes, streptomycin as specific therapy for TB, scientific research in pharmaceutical company laboratories and the mechanisms whereby the products of that research were manufactured, marketed and utilized in the clinic, the increasing recognition of the clinical successes and the subsequent problems of antibiotic resistance, and the discovery of the mechanisms that transferred resistance. Participants include: Dr Ralph Batchelor, Sir John Crofton, Professor Naomi Datta, Dr Peter Doyle, Professor Harold Lambert, Professor D A Mitchison and Professor Gordon Stewart. Tansey E M, Reynolds L A. (eds) (2000) Post penicillin antibiotics: From acceptance to resistance? Wellcome Witnesses to Twentieth Century Medicine, vol. 6. London: The Wellcome Trust.The Wellcome Trust is a registered charity, no. 210183