“Vielleicht für menschliche Kräfte unausführbar.” A mathematical proof of a Danish astronomer?

Dějiny matematiky / Mathematics throughout the ages. Contributions from the summer school and seminars on the history of mathematics and from the 10th and 11th Novembertagung on the history and philosophy of mathematics, Holbaek, Denmark, October 28-31, 1999, and Brno, the Czech Republic, November 2-5, 2000

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