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Θ. Bolzano
Παρουσίαση Θ.Bolzano με τη βοήθεια γραφικής παράστασης.
Πότε μια συνάρτηση λέγεται συνεχής;
Ποιά η γεωμετρική ερμηνεία της συνέχειας;