On a Complex KenKen Problem
David Nacin · College Mathematics Journal · 2017
SummaryIn his popular blog, Brian Hayes presented a four-by-four KenKen puzzle over a set of complex numbers, mentioning that he had not checked the uniqueness of the solution. Here, we study all cage patterns over similar puzzles that allow for unique solutions and show that they are equivalent to Hayes's choice. We define a group action that preserves the size of solution sets and proceed to classify all puzzles with unique solutions before concluding with suggested activities and several open questions.