Hailstone problem, the Syracuse problem, Kakutani's problem, Hasse's algorithm, and the Collatz problem. 根據 Template:Named ref p. 4, 「Syracuse問題」呢個名係由Hasse喺1950年代去訪問雪城大學嗰陣時提議嘅。
Science and Engineering: Proceedings of an International Conference held at Syracuse, Italy. History of Mechanism and Machine Science.第11卷. Springer. doi:10
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