With Hobson's notation:(adsbygoogle = window.adsbygoogle || []).push({});

H=(da/dt)/a

dH/dt = ((d2a/dt2)/a) - ((da/dt)/a)2

If ((d2a/dt2)/a) is negative, (dH/dt) is certainly negative.

But if ((d2a/dt2)/a) is positive, (dH/dt) can be positive or negative.

What is your interpretation?

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# I'd like to know your interpretation.

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