Can someone explain to me the proof of Lemma 1 (iii) in this paper http://www.stsci.edu/~RAB/Backup%20Oct%2022%202011/f_3_CalculationForWFIRSTML/Bob1.pdf
I'm having trouble understanding the reasoning behind the infinitesimal perturbation.
2026-03-26 19:04:06.1774551846
Smallest enclosing circle proof
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