This book depicts graph labelings that have led to thought-provoking
problems and conjectures. Problems and conjectures in graceful
labelings, harmonious labelings, prime labelings, additive labelings,
and zonal labelings are introduced with fundamentals, examples, and
illustrations. A new labeling with a connection to the four color
theorem is described to aid mathematicians to initiate new methods and
techniques to study classical coloring problems from a new perspective.
Researchers and graduate students interested in graph labelings will
find the concepts and problems featured in this book valuable for
finding new areas of research.