2 votes 2 votes How many proper subgroups does the group $\mathbb{Z} ⊕ \mathbb{Z}$ have? $1$ $2$ $3$ Infinitely many Set Theory & Algebra tifrmaths2014 group-theory + – makhdoom ghaya asked Dec 17, 2015 • edited Aug 18, 2020 by soujanyareddy13 makhdoom ghaya 1.1k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes I think the answer is Infinitely many. Harry Richie answered Oct 5, 2019 Harry Richie comment Share Follow See all 0 reply Please log in or register to add a comment.