Jackson 5.6 Problem: Find Which is True & Why?

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I have a question from jackson 5.26. Details are in my weblog:
http://buyanik.wordpress.com/2009/04/19/about-jackson-problem-526/
After anyone have read my weblog post, the question is which problem is true and why?
Thanks.
 
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Are you asking about what equation is correct? Just transform the equations (if needed) and verify if the units are correct.
 
To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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