# Re: To John Harshman -- re Isochrons

• From: Harlequin <usenet@xxxxxxx>
• Date: Wed, 01 Mar 2006 03:59:42 GMT

Zoe <muze10@xxxxxxx> wrote in news:301a02d1bucuebjcv2b1e0frgvp9itddro@
4ax.com:

[snip]
exactly. The reality that oldD/Di is mixed with new D/Di, and there
is no way to separate them is why the need for mathematical
intervention.
[snip]

Mathematical intervention must be your word for
deductive conclusion via _elementary_ mathematics. If the premises
are true, the conclusion MUST be with 100% certainty. You can
question the premises, but not the proof.

Why do we need to separate the D that is was originally
in the rock from the D that was the result of radioactive
decay? If you know that math, you know that we simply don't
have to do that. It was probably a mistake for anyone to
tell you that the (D/Di)0 could be deduced from the y-intercept
since it has really distracted you. The isochron equation
is nothing more than what everyone should have learned in
eighth grade: y=mx+b. It just so happens m is equal to
e^(lambda times t)-1. That is one equation and one unknown
and can easily be solved. That b just so happens to
correspond to (D/Di)0 is just icing on the cake.

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