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Jul 10, 2017 at 22:43 answer added Christian Remling timeline score: 6
Jul 10, 2017 at 20:52 comment added YCor Not enough: $abca^{-1}b^{-1}$ is not "positive".
Jul 10, 2017 at 17:43 comment added Wlod AA Perhaps the total sum of exponents for every generator should be non-negative, and at least one of these sums should be positive.
Jul 10, 2017 at 17:32 history asked user49822 CC BY-SA 3.0