I disagree a bit - hard sf is something that has a universe with consistent laws based on our current understanding of physics; eg in Greg Egan upcoming Clockwork Rocket, the universe is not Einsteinian but Riemannian (the metric is ds^2 + dt^2 rather than ds^2-dt^2 in our universe, where s is distance, t is time, units are such that c=1); he worked very hard at deducing and speculating what happens in such a universe - check his website for a lot of such details in addition to what is in the book - and that book is hard sf otherwise the term means just mundane sf which is something very different imho
Reynolds is pretty hard sf under any reasonable definition




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