discrete group (Q1361055)
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a discrete subgroup of a topological group G is a subgroup H such that there is an open cover of H in which every open subset contains exactly one element of H; in other words, the subspace topology of H in G is the discrete topology
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English 
discrete group

a discrete subgroup of a topological group G is a subgroup H such that there is an open cover of H in which every open subset contains exactly one element of H; in other words, the subspace topology of H in G is the discrete topology

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Wikipedia(12 entries)
 cawiki Grup discret
 dewiki Diskrete Untergruppe
 enwiki Discrete group
 eowiki Diskreta grupo
 eswiki Grupo discreto
 frwiki Groupe discret
 jawiki 離散群
 kowiki 이산군 (수학)
 nlwiki Discrete groep
 plwiki Grupa dyskretna
 ukwiki Дискретна група
 zhwiki 離散群