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when toggle format what by license comment
Feb 26, 2017 at 4:46 comment added Brendan McKay You might also want to clarify if addition is in $\mathbb Z$ or $\mathbb F_2$.
Feb 25, 2017 at 16:37 review Low quality posts
Feb 25, 2017 at 18:21
Feb 25, 2017 at 16:32 history edited Seva
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Feb 25, 2017 at 16:32 comment added Seva $|A+A|$ can be as small as $0$ (if $A=\emptyset$), and $|A+A|/|A|$ can be as small as $1$ (if $A$ is a singleton). You should be more specific with your question!
Feb 25, 2017 at 14:35 review Low quality posts
Feb 25, 2017 at 15:19
Feb 25, 2017 at 14:20 review First posts
Feb 25, 2017 at 14:27
Feb 25, 2017 at 14:17 history asked sumsetproblem CC BY-SA 3.0