[seqfan] Re: Eventually-signed sequences

[Alonso Del Arte]

The policy as described by Franklin certainly makes it easy to handle
sequences for which we are not certain that they do or do not contain
negative numbers. Still, I think it would be better for the sign keyword to
apply even if no negative terms are "visible," and for sequences of unknown
status to go off the best thinking on the subject (e.g., in the case of
A086811, since H. Moller who wrote the paper cited for that sequence thinks
it contains no negative terms, it should be nonn rather than sign).

Just my two cents,
Al

On Thu, Mar 25, 2010 at 7:28 PM, <franktaw at netscape.net> wrote:

> The policy has long been that the sequence should have the "sign"
> keyword if there are negative values entered in the sequence -- that
> is, in the %V, %W, and %X lines.  So your 85 examples below should be
> "nonn".  It looks like your 20 "nonn" sequences with negative values
> have them only in b-files or other extension, so they are correct.
>
> Franklin T. Adams-Watters
>
> -----Original Message-----
> From: Charles Greathouse <charles.greathouse at case.edu>
>
> What is the policy on sequences that have (or may have) negative
> members, none of which appear in the %S, %T, and %U lines?  I tend to
> think that ones that are known to have negative members should have
> ,sign, while I'm not sure how unknown sequences should be handled.
> It's probably worthwhile to standardize this, though.
>
> [I collected as many examples as I was able, but these lists are
> surely not exhaustive.]
>
> 20 ,nonn, sequences that have negative members:
> A139367(332) = -1
> A139368(219) = -4
> A158635(191) = -5
> A161808(43) = -162729
> A118480(1473) = -1
> A083453(76) =
> -107072670495624009016895613003103720906284316963673667118616280702745282
> 63913282598677341871106721376332267734023257341356855990577704906898255
> A092243(41253) = -1
> A005444(35) = -230450728485788167742674544892530875760640
> A088819(34) = -34330952514996673312513889666926080
> A112632(23338590792) = -1
> A133097(65) = -130
> A072203(906150257) = -1
> A103222(130) = -16
> A038698(26861) = -1
> A033885(180) = -6
> A066520(26861) = -1
> A034598, A057752, A059571, A052435
>
> 85 ,sign, sequences that have no negative members in their %V, %W, or
> %X lines:
> A015868, A014856, A015582, A014646, A014590, A014922, A014988,
> A015076, A015120, A015142, A015186, A015208, A015252, A015406,
> A015450, A015516, A015538, A015648, A015670, A015736, A015802,
> A015846, A015912, A015978, A016000, A016110, A016132, A015088,
> A015166, A015270, A015322, A015348, A015400, A015426, A015478,
> A015660, A015712, A015790, A015816, A015946, A015972, A016050,
> A016128, A016180, A016258, A015420, A015522, A015658, A015726,
> A015760, A015828, A015862, A015930, A016168, A016236, A015586,
> A015700, A015852, A015928, A015966, A016042, A016080, A016156,
> A015918, A016056, A016240, A110857, A009542, A013091, A121573,
> A009196, A009268, A012821, A157809, A006044, A130119, A157812,
> A157827, A158516, A158530,A158531, A158532, A091750, A091751, A091758
>
> Sequences whose signs are unknown include:
> A086811, A075469, A095883, A096801
>
> (A034414, A034415)
>
> Charles Greathouse
> Analyst/Programmer
> Case Western Reserve University
>
>
>
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