Meta-commentary: I think we all need to keep our loop gain under control when it comes to social issues like these. Runaway negative feedback is how society becomes more polarized and oscillates out of control. Discussion is worth having, but keep it positive!
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Closed loop gain has to be > 1 when phase of feedback is > 180 relative to input for oscillation to occur. Phase > 180 means multiply gain by -1, so negative becomes positive feedback.
That's a frequency-dependent analysis, yes. Usually the steady-state construction has negative feedback, which then becomes a positive gain of >1 at a given frequency due to loop delay putting the feedback out of phase.
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I don't understand what you're talking about unfortunately/how steady state plays into it. I'm thinking mainly in terms of phase margin (a freq-dependent analysis?)
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I'm talking about the problem of control system stability. A closed loop control system has negative feedback (take the error signal, invert it, apply it to the input somehow), but that can yield positive gain at certain frequencies because there is loop delay.
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