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Caption: Mathematical Models by Arnold Emch - Series 4 (1928)
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IV Series 27 Fig. 17 the second kind on the given cubic. Thus in the involution (Bi, Bz) Xi corresponds to X . T w o involutions of the first kind, when distinct, produce an involution of the second kind. Thus the Steiner involution on B sends X into F, the Steiner involution on B2 sends F into X\. Hence the product of the two central involutions is a noncentral involution X , X± (of the second kind).
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