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Ideas for proofs in geometry. (Beweisideen in der Geometrie.) (German)
Math.inf., No. 55, 24-41 (2011).
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Limits of computability: Discovery and exploratory learning in practice. (Grenzen der Berechenbarkeit: Entdeckendes und forschendes Lernen in der Praxis.) (German)
Log In 31, No. 168, 42-49 (2011).
2
On the history of the parallel problem and the non-Euclidean geometries. (Zur Geschichte des Parallelenproblems und der nichteuklidischen Geometrien.) (German)
Math.unterr. 56, No. 6, 3-15 (2010).
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