Geodesic
Local and global Notions Concerning Functions
Matematičeskoe obrazovanie, Tome 27 (2003) no. 4, pp. 67-74.

Voir la notice de l'article provenant de la source Math-Net.Ru

The author explains, for high school students, which properties of functions can be called "local" or "global" and what is implicit function. 
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S. V. Dvoryaninov. Local and global Notions Concerning Functions. Matematičeskoe obrazovanie, Tome 27 (2003) no. 4, pp. 67-74. http://geodesic.mathdoc.fr/item/MO_2003_27_4_a5/