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. 2012 May 16;7(5):e36895. doi: 10.1371/journal.pone.0036895

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Chen et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Panel (a) depicts the fraction of cooperators in the whole population as a function of time for fixed lower limit and different values of upper limit. Panel (b) depicts the fraction of cooperators in the whole population as a function of time for fixed upper limit and different values of lower limit. Increasing the values of lower and upper limit can provide more positive effects on the evolution of cooperation. Here, and .

Inline graphic — Panel (a) depicts the fraction of cooperators in the whole population as a function of time for fixed lower limit and different values of upper limit. Panel (b) depicts the fraction of cooperators in the whole population as a function of time for fixed upper limit and different values of lower limit. Increasing the values of lower and upper limit can provide more positive effects on the evolution of cooperation. Here, and .