Geodesic
O różnych sposobach definiowania wartość bezwzględnej
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia, Tome 2 (2009) no. 1, pp. 29-36

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In this article we present some didactic ideas of introducing theabsolute value of a real number by means of functional equations and aninequality. The basic properties of the absolute value of a real number arewritten as functional equations and an inequality. The function "absolutevalue" is a solution of a suitable functional equation or an inequality. 
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Chronowski, Antoni; Major, Joanna; Powązka, Zbigniew. O różnych sposobach definiowania wartość bezwzględnej. Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia, Tome 2 (2009) no. 1, pp. 29-36. http://geodesic.mathdoc.fr/item/AUPCDM_2009_2_1_a2/