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Published online by Cambridge University Press: 20 January 2009
§ 1. In the Life and Letters of Lewis Carroll occurs the following extract from his Diary:—
“Dec. 19 (Sun).—Sat up last night till 4 a.m., over a tempting problem, sent me from New York, ‘to find 3 equal rational-sided rt.-angled ∆&s.’ I found two, whose sides are 20, 21, 29; 12, 35, 37; but could not find three.' (v. page 343.)