Todo poliedro convexo, denominado isoedro, possui um número par de lados (Grünbaum 1960). Dadas as suas simetrias, os isoedros representam dados justos, sendo ao todo 30 isoedros.
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Grünbaum, B. "On Polyhedra in E3 Having All Faces Congruent.'' Bull. Research Council Israel 8F, 215-218, 1960.
Grünbaum, B. and Shepard, G. C. "Spherical Tilings with Transitivity Properties.'' In The Geometric Vein: The Coxeter Festschrift (Ed. C. Davis, B. Grünbaum, and F. Shenk). New York: Springer-Verlag, 1982.