Hiroshi Okumura and Saburou Saitoh,
Remarks for the twin circles of Archimedes in a skewed arbelos,
Forum Geometricorum, 18 (2018) 99--102.

Abstract. From the viewpoint of the division by zero (0/0 = 1/0 = z/0 = 0) and the division by zero calculus, we will show some surprising new phenomena for geometrical properties with the concrete example which was given by the paper "The Twin Circles of Archimedes in a Skewed Arbelos" of H. Okumura and T. Watanabe, Forum Geom., 4 (2004) 229--251.

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