A problem I often encounter is deciding who to invite as co-authors. On one hand, you want to show appreciation to the people that helped you in the process of obtaining your results. On the other hand, generously adding authors will dilute the contribution of the people that made the largest contribution. In this post I would like to sketch a few hypothetical situations in which someone could be a co-author. The main goal here is to provoke some discussion on this subject, and learn about some good practices.

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