Abstract
A new class of plane-symmetric solutions of Einstein's equations with perfect fluid source and an equation of statep=γϱ (γ=const.) is presented. It contains the static vacuum solution, a special Kasner solution and the flat Friedmann-Robertson-Walker spacetime as subclasses. The only class for which the matter distribution is truly inhomogeneous (class D in the sequel) represents matter concentrated around a planar orbit of the symmetry group in an expanding universe.
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