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The Henneaux-Gibbons-Hawking-Stewart canonical measure is calculated for spatially flat but anisotropically expanding universes (diagonal Bianchi type I) minimally coupled to a homogenous massive scalar field. Both inflationary and noninflationary solutions have infinite measure, giving an ambiguous classical probability for inflation in these models. A one-parameter family of methods for taking the ratio is described, and it is shown how it can give a probability ranging from zero to unity.
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Chmielowski et al. (1988) studied this question.
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