Geodesic
Od hipotezy do twierdzenia
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia, Tome 4 (2012) no. 1, pp. 75-82.

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In the paper, on the basis of elementary geometrical content, the authors present examples of students' reasoning, which permits, in the first place, to formulate a hypothesis, and further to find a proof. The essential fact here is that the same hypothesis can lead students to follow different possible ways of reasoning. 
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Górowski, Jan; Klakla, Maciej; Łomnicki, Adam. Od hipotezy do twierdzenia. Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia, Tome 4 (2012) no. 1, pp. 75-82. http://geodesic.mathdoc.fr/item/AUPCDM_2012_4_1_a4/