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Chử Đồng Tử statue at Dạ Trạch Temple. Chử Đồng Tử (Chữ Hán: 褚童子) is the name of a famous Vietnamese divine being, one of "The Four Immortals" "Tứ bất tử" in traditional Vietnamese mythology. [1]
A cycloid generated by a rolling circle. In geometry, a cycloid is the curve traced by a point on a circle as it rolls along a straight line without slipping. A cycloid is a specific form of trochoid and is an example of a roulette, a curve generated by a curve rolling on another curve.