Let $S_{\Bbb N}$ be the countable symmetric group of all permutations of the naturals with finite support and $A_{\Bbb N}$ --- the corresponding alternating group.
How to describe all maximal subgroups of these groups which are isomorphic to $S_{\Bbb N}$?
Is it possible to obtain the answer from well-known answers on the same question for the finite case?