## Re: Rational / Irrational Pi ???

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• ... If you can express it with finite digits and no symbols representing any other numbers and no trailing......, and it is exact as you say, it is rational
Message 1 of 3 , Apr 25 1:59 PM
<alden_parent@y...> wrote:

> Hi friends,
>
> 21.99113 / 7 = 3.14159 exactly
>
> Is this rational, irrational ??

If you can express it with finite digits and no symbols representing
any other numbers and no trailing......, and it is exact as you say,
it is rational under simple operations.

Your ratio is rather uninspired as pointed out in the previous
response. The trick is to find a ratio of two co-prime integers p/q
that approximates the irrational number to a desired decimal
accuracy . Such a ratio can always be found trivially to whatever
decimal accuracy of you care to (can calculate to). When
approximating an irrational number, there are an infinity of
instances of p/q that differ from the actual number by no more than
1/q, but such a close approximation is not infinitely possible for a
rational number (to make up for this, you get to have the one
instance of exact equality).

-Dick Boland

> It certainly gives to non-transcendental Pi!
> Does it not?
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