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*From*: John Denker <jsd@av8n.com>*Date*: Mon, 4 Oct 2021 21:19:16 -0700

Hi Folks --

This is relevant to measuring radioactive decays ... and to

many other things. Very very many.

Consider the definite integral of exp(-a t) dt from t1 to t2.

Here is the "textbook" answer:

https://www.wolframalpha.com/input/?i=integral+exp%28-a+t%29+dt+from+t1+to+t2

Now explain why that is *not* the formula that I use in

my software.

What is the smart way of doing it?

I'll post my answer tomorrow, if nobody nails it before then.

The usual jsd puzzle rules apply. Everything I've said is true

to the best of my knowledge. Probably even helpful. No word

games. There are undoubtedly more than one right answer, but

I expect everybody will agree my answer is as good as any,

and vastly better than the "textbook" answer.

**Follow-Ups**:**Re: [Phys-L] numerical methods***From:*bernard cleyet <bernardcleyet@redshift.com>

**Re: [Phys-L] numerical methods***From:*Ken Caviness <caviness@southern.edu>

**Re: [Phys-L] numerical methods***From:*David Bowman <David_Bowman@georgetowncollege.edu>

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