Geodesic
What is a Group of Functions
Matematičeskoe obrazovanie, no. 4 (2007), pp. 2-8 
S. V. Dvoryaninov. What is a Group of Functions. Matematičeskoe obrazovanie, no. 4 (2007), pp. 2-8. http://geodesic.mathdoc.fr/item/MO_2007_4_a0/
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     author = {S. V. Dvoryaninov},
     title = {What is a {Group} of {Functions}},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2007_4_a0/}
}
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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.