Mathematics Letters

Volume 3, Issue 1, February 2017

  • Minimum Time Problem for n×n Co-operative Hyperbolic Lag Systems

    Hussein El-Saify, Mohammed Shehata

    Issue: Volume 3, Issue 1, February 2017
    Pages: 1-11
    Received: 17 December 2016
    Accepted: 30 December 2016
    Published: 30 March 2017
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    Abstract: In this paper, a minimum time problem for n×n co-operative hyperbolic systems involving Laplace operator and with time-delay is considered. First, the existence of a unique solution of such hyperbolic system with time-delay is proved. Then necessary conditions of a minimum time control are derived in the form of maximum principle. Finally the bang-... Show More
  • Social, Biology and Economic Life of Children Links on Street-Begging in Bangladesh: A Cross-Cultural Multivariate Analysis

    Md Kamruzzaman, Md Abdul Hakim

    Issue: Volume 3, Issue 1, February 2017
    Pages: 12-19
    Received: 21 February 2017
    Accepted: 18 March 2017
    Published: 14 April 2017
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    Abstract: The study was conducted at four upazilas in Dhaka city of Bangladesh taking 70.73% boys and 29.29% girls using convenience sampling method. About 41.46% respondents were 2501-3000 BDT, 9.75% were 1001-1500 BDT and 3001-3500 BDT earners having 82.92% respondents no link with other occupations. Some 53.66% fathers of the respondents were rickshaw pul... Show More