Geodesic
To be integer or not to be rational: that is the questio$\sqrt{N}$
The Teaching of Mathematics, XVI (2013) no. 2, p. 79 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Another proof is given of the fact that the square root of a nonnegative integer is either an integer or an irrational. Bibliography on this theme is presented.
Classification : 1MSC97F60 2MathEducF64
Keywords: Rational and irrational numbers. 
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Samuel G. Moreno; Esther M. García-Caballero. To be integer or not to be rational: that is the questio$\sqrt{N}$. The Teaching of Mathematics, XVI (2013) no. 2, p. 79 . http://geodesic.mathdoc.fr/item/TM2_2013_XVI_2_a2/