Geodesic
What is a Group of Functions
Matematičeskoe obrazovanie, Tome 44 (2007) no. 4, pp. 2-8

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

The notion of group of functions is introduced for school students aged 15-17. Numerous examples and some ways of obtaining function groups are discussed. 
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S. V. Dvoryaninov. What is a Group of Functions. Matematičeskoe obrazovanie, Tome 44 (2007) no. 4, pp. 2-8. http://geodesic.mathdoc.fr/item/MO_2007_44_4_a0/