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  • 1980-1984  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 80 (1981), S. 271-300 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We show that any asymptotically flat initial data for the Einstein field equations have a development which includes complete spacelike surfaces boosted relative to the initial surface. Furthermore, the asymptotic fall off is preserved along these boosted surfaces and there exists a global system of harmonic coordinates on such a development. We also extend former results on global solutions of the constraint equations. By virtue of this extension, the constraint and evolution parts of the problem fit together exactly. Several theorems are given which concern the behaviour in the large of general classes of linear and quasilinear differential systems. This paper contains in addition a systematic exposition of the functional spaces employed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    GeoJournal 6 (1982), S. 373-380 
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract Existing international literature on part-time farming derives mainly from developed country situtations. The vast and heterogeneous developing world awaits documentation, analysis and interpretation. New approaches will also be required due to different conditions, such as overwhelming dependence on agricultural employment, skewed patterns of access to land and high levels of landlessness. Heritage is also different as are future prospects. Colonial economic management introduced constrained part-time farming. For the native population, poll taxes induced migration to plantations. The Hacienda system in Latin America provides a built-in system of dependent part-time farming. Capitalist farming has been spreading rapidly, sometimes fueled by “land reforms”, and has boosted the use of the vast class of small farmers, usually part-timers, as a pool of low-cost and docile labour. Trends are not re-assuring. Entrepreneurial agriculture tends to displace small holders from the land and to throw them on to the labour market while at the same time it generally lowers the employment capacity of agriculture through modernization of production. Parttime farming seems as unstable as ever and operates against a secular threat to the employment and income of the vast rural labour force. Part-time farming in the developing world merits deep probing and imaginative assessment.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta mathematica 146 (1981), S. 129-150 
    ISSN: 1871-2509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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