Abstract
Let f: ℝn→ ℝn (3 <n <∞) be a mapping which preserves the area of equilateral triangles of side lengths 1,1,1. Then f is a euclidean motion. For n=3 the same holds if the area of triangles with side lengths 1,1,√3 is also preserved.
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F.S. BECKMAN, D.A. QUARLES: On Isometries of Euclidean Spaces. Proc. Amer. Math. Sec4, 810–815.
P. GOUDERC, A. BALLINCIONI: Premier Livre du Tétraèdre, Paris 1953.
J. LESTER: Martin's theorem for Euclidean n-Space and a generalization to the perimeter case. Journ. of Geometry27, 29–35, 1986.
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Herrn Prof. Otto Haupt zum 100. Geburtstag gewidmet
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Lenz, H. Über einen Satz von June Lester zur Charakterisierung euklidischer Bewegungen. J Geom 28, 197–201 (1987). https://doi.org/10.1007/BF01221944
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DOI: https://doi.org/10.1007/BF01221944