http://worldcat.org/entity/work/id/137285418

Proving inverse-positivity of linear operators by reduction

A method is presented to prove that a linear operator M is inverse-positive, i.e. Mu = or> o implies u = or> o. The method consists in reducing the problem for the given operator M to a simpler problem. Sometimes, iterated reductions are appropriate, for example, if M is a differential operator of higher order. (Author).

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