Dead list?

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GMG

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Jul 30, 2020, 1:26:24 PM7/30/20
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Is this list dead now?

Frank J. Lhota

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Jul 31, 2020, 6:40:58 AM7/31/20
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On 7/30/2020 1:26 PM, GMG wrote:
> Is this list dead now?
>

The volume on all the USENET groups is way down.

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Let everything be as it should be;
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David LaRue

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Jul 31, 2020, 9:12:15 PM7/31/20
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"Frank J. Lhota" <FrankJLho...@rcn.com> wrote in news:rg0sfo$1nn6$1
@gioia.aioe.org:

> On 7/30/2020 1:26 PM, GMG wrote:
>> Is this list dead now?
>>
>
> The volume on all the USENET groups is way down.
>

Perhaps, but they're all still here.

Hen Hanna

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Aug 29, 2022, 1:07:07 PM8/29/22
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2 days ago, i wrote:
> # TIF (Today I found) https://groups.google.com/g/alt.math.recreational


(because i didn't see any Spam posts,) i didn't realize how infrequent the posts here are/were.


______________________________

is there a simple desc. for all the numbers that can be
expressed as ( 1/x + 1/y ) where x,y are positive integers ?

What are some rational number(s) z ( 0 < z < 2 )
not expressible as ( 1/x + 1/y ) where x,y are positive integers ?

Barry Schwarz

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Aug 29, 2022, 2:29:16 PM8/29/22
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On Mon, 29 Aug 2022 10:07:06 -0700 (PDT), Hen Hanna
<henh...@gmail.com> wrote:

>2 days ago, i wrote:
>> # TIF (Today I found) https://groups.google.com/g/alt.math.recreational
>
>
>(because i didn't see any Spam posts,) i didn't realize how infrequent the posts here are/were.
>
>
>______________________________
>
> is there a simple desc. for all the numbers that can be
> expressed as ( 1/x + 1/y ) where x,y are positive integers ?
>
>What are some rational number(s) z ( 0 < z < 2 )
>not expressible as ( 1/x + 1/y ) where x,y are positive integers ?

It appears that 3/7 cannot be expressed this way. It seems that
numbers of the form p1/p2 where the p's are distinct primes > 2 might
be one class that satisfies your query.

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Hen Hanna

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Aug 29, 2022, 2:57:22 PM8/29/22
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yes, the rule must be something like that.....

except... 3/5, 7/13... can be expressed as ( 1/x + 1/y ) ---- maybe these are special cases

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