"Anon."  wrote in message
news:...

> and the fitnesses of other individuals.  It's possible that an action
> will increase the fitness of both the actor and an actee [??], but the
> evolution in this case is not interesting.  Actually, it does come under
> Hamilton's rule - the cost, c, is negative.  As the benefit and
> relatedness are both positive, the action will always be favoured by
> evolution.

only so long as the relatedness *is* positive.
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