Magic Labeling

It is conjectured that every Tree with edges whose nodes are all trivalent or monovalent can be given a ``magic''labeling such that the Integers 1, 2, ..., can be assigned to the edges so that the Sum of thethree meeting at a node is constant.

References

Guy, R. K. ``Unsolved Problems Come of Age.'' Amer. Math. Monthly 96, 903-909, 1989.

• Hurwitz Equation
• Hurwitz Number
• Hurwitz Polynomial
• Hurwitz-Radon Theorem
• Hurwitz's Irrational Number Theorem
• Hurwitz's Root Theorem
• Hurwitz Zeta Function
• Hutton's Formula
• Hutton's Method
• Hyperbola
• Hyperbola Evolute
• Hyperbola Inverse Curve
• Hyperbola Pedal Curve
• Hyperbolic Automorphism
• Hyperbolic Cosecant
• Hyperbolic Cosine
• Hyperbolic Cotangent
• Hyperbolic Cube
• Hyperbolic Cylinder
• Hyperbolic Dodecahedron
• Hyperbolic Fixed Point (Differential Equations)
• Hyperbolic Fixed Point (Map)
• Hyperbolic Functions
• Hyperbolic Geometry
• Hyperbolic Inverse Functions