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Friedmann equation - show Big Bang happened given conditions
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[QUOTE="mfb, post: 5723956, member: 405866"] I don't think you can just set k=-1, although it doesn't change the conclusion here. It is not necessary to do that, all you need is k<0 in the following argument. If the first derivative is positive, then the original function decreases if we go back in time. This does not depend on the second derivative. [/QUOTE]
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Friedmann equation - show Big Bang happened given conditions
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