Two-, three-, and four-mirror unobscured telescopes unfolded in a plane fall into exactly 6, 32, and 288 topological classes, each encoded by a GOFF A name.
Quantifier elimination for the elementary theory of real closed fields by cylindrical algebraic decomposition, Springer LNCS , 33, (1975)
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An original classification of obscuration-free telescopes designs unfolded in two dimensions
Two-, three-, and four-mirror unobscured telescopes unfolded in a plane fall into exactly 6, 32, and 288 topological classes, each encoded by a GOFF A name.