Geodesic
An improved upper bound for the sum-free subset constant
Journal of integer sequences, Tome 13 (2010) no. 8
We show that the optimal constant in Erdős' sum-free subset theorem cannot be larger than 11/28 ≈ .393.
Classification : 11B30
Keywords: sum-free subset 
@article{JIS_2010__13_8_a2,
     author = {Lewko,  Mark},
     title = {An improved upper bound for the sum-free subset constant},
     journal = {Journal of integer sequences},
     year = {2010},
     volume = {13},
     number = {8},
     zbl = {1216.11029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2010__13_8_a2/}
}
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Lewko,  Mark. An improved upper bound for the sum-free subset constant. Journal of integer sequences, Tome 13 (2010) no. 8. http://geodesic.mathdoc.fr/item/JIS_2010__13_8_a2/