Geodesic
On Nearly Subadditive Maps
Funkcionalʹnyj analiz i ego priloženiâ, Tome 50 (2016) no. 1, pp. 93-96

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Several results on stability in spirit of Ulam and Hyers are obtained for classes of maps from groups to lattices satisfying the subadditivity condition $$ F(gh) \subset F(g)\cup F(h) \quad \text{for all }\ g,h \in G. $$
Keywords: subadditive set-valued maps on groups, addition theorems, stability problems. 
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     author = {E. V. Shul'man},
     title = {On {Nearly} {Subadditive} {Maps}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2016_50_1_a10/}
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E. V. Shul'man. On Nearly Subadditive Maps. Funkcionalʹnyj analiz i ego priloženiâ, Tome 50 (2016) no. 1, pp. 93-96. http://geodesic.mathdoc.fr/item/FAA_2016_50_1_a10/