For three-mirror coaxial telescopes, the first-order admissible solution set splits into finitely many connected components, each named uniquely by a signature of magnification and curvature signs.
Collins, Quantifier elimination for the elementary theory of real closed fields by cylindrical algebraic decomposition, 33 (1975)
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A certified classification of first-order controlled coaxial telescopes
For three-mirror coaxial telescopes, the first-order admissible solution set splits into finitely many connected components, each named uniquely by a signature of magnification and curvature signs.