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With some caveat, it turns out I was :-O
That's exactly the question I was asking. And "After the initial period of adjustment" does all the work of carry out your argument, so...
Well then, the answer is "none".
No, it doesn't. Are we talking about the minimum size of a more-or-less steady-state high-tech (hyphen-love!) civilization? or are we talking about the minimum size of a seed population from which a high-tech civilization can reconstruct itself while, presumably, growing in the process?