"John Edser"  wrote in message
news:...
> "Anon."  wrote

> > BOH:-
>  .. 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.
> 
> JE:-
> Yes, it comes under the condition within the
> rule where rb< c. This,  in  reality, is the only
> true condition of Hamilton's rule.
> 

c is defined as the direct fitness deficit accrued by the actor.  If
the act is detrimental to the direct fitness of the actor, c is
positive.  If the act improves the direct fitness of the actor, c is
negative.  so when r and b are positive, r b is most certainly not <
c.
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