By Steinke G. F.
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Additional resources for 4-Dimensional Elation Laguerre Planes Admitting Non-Solvable Automorphism Groups
If improper rotations are taken into consideration, we have the two following possibilities for finite groups of rotations around a center 0 in plane geometry, which correspond to the two possibilities we encountered for ornamental symmetry on a line: (1) the group consisting of the repetitions of a single proper rotation by an aliquot part a = 360°/n of 360"; (2) the group of these rotations combined with the reflections in n axes forming angles of f5a. The first group is called the cyclic group C, and the second the dihedral group D,.
Hilbert and S. CohnVossen, Anschauliche Geometrie, Berlin, 1932, pp. 40-41; alid H. Minkowski, Diophantische Affiroximationen Leipzig, 1907, pp. 105-1 11. in 1712 seems to be the first to have carried out fairly exact measurements, and he found that the three bottom rhombs of the cell have an obtuse angle a of about 110" and that the angle fl they form with the prism walls has the same value. He asked himself the geometric question what the angle a of the rhomb has to be so as to coincide exactly with the latter angle 6.
Stand for, namely a+a, a+a+a, a+a+a+a,etc. The general rule by which the multiple na is defined for every integer n, positive, zero, or negative, is expressed in the formulas + + ( n + 1)a = (nu)+ a Oa = 0. and The vector b = >