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arXiv math.CO bot · @arXiv_mathCO_bot
9 followers · 7890 posts · Server mastoxiv.page

We consider the Tutte polynomial of three classes of greedoids: those arising from rooted graphs, rooted digraphs and binary matrices. We establish the computational complexity of evaluating each of these polynomials at each fixed rational point (x,y). In each case we show that evaluation is -hard except for a small number of exceptional cases when there is a polynomial time algorithm. In the binary case, establishing -hardness along one line relies on Vertigan's unpublished result on the complexity of counting bases of a matroid. For completeness, we include an appendix providing a proof if this result.
[arxiv.org/abs/2309.04537v1]

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Last updated 1 year ago
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arXiv cs.CC bot · @arXiv_csCC_bot
8 followers · 1174 posts · Server mastoxiv.page

We study the approximability of computing the partition functions of two-state spin systems. The problem is parameterized by a $2\times 2$ symmetric matrix. Previous results on this problem were restricted either to the case where the matrix has non-negative entries, or to the case where the diagonal entries are equal, i.e. Ising models. In this paper, we study the generalization to arbitrary $2\times 2$ interaction matrices with real entries. We show that in some regions of the parameter space, it's \-hard to even determine the sign of the partition function, while in other regions there are fully polynomial approximation schemes for the partition function. Our results reveal several new computational phase transitions.
[arxiv.org/abs/2309.04735v1]

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Last updated 1 year ago
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Japan Pop Videos · @videos
42 followers · 2937 posts · Server wakoka.com
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Last updated 1 year ago
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Xxcp876 · @Xxx97754
0 followers · 1 posts · Server pawoo.net

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MOE ZINE · @moezine
18 followers · 1305 posts · Server ol2ol.com
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【元P&G役員に大木優紀が学ぶ】明日から使える“最強&最新”マーケティングメソッド／本質的フレームワーク「9segs®」はこう使え／顧客戦略はWHO×WHATで導き出せ(STAR SKILL SET) moezine.com/800826/

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Last updated 1 year ago
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Ladies.de Sex Anzeigen · @Ladies_DE
33 followers · 7954 posts · Server kollegin.eu

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Last updated 1 year ago
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· @ChloeCp733
0 followers · 1 posts · Server pawoo.net
Open media

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Last updated 1 year ago
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· @Chlo0005326
0 followers · 1 posts · Server pawoo.net
Open media

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Last updated 1 year ago
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· @Chloe10372
0 followers · 1 posts · Server pawoo.net
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Last updated 1 year ago
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Piratenpartei NRW · @piraten
201 followers · 1028 posts · Server nrw.social
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Wir suchen per Ausschreibung ehrenamtliche Mitarbeiter:innen für unser Team "Öffentlichkeitsarbeit".
Hier gibts alle Infos:
piratenpartei-nrw.de/landesver

Meld Dich einfach, wenn Du mitmachen möchtest. IRATEN

#p #nrwohlfuhlen

Last updated 1 year ago
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· @Prettycat08322
0 followers · 1 posts · Server pawoo.net
Open media

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Last updated 1 year ago
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· @Chloehot869843
0 followers · 1 posts · Server pawoo.net
Open media

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Telegram: t.me/chloe_hot54

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Last updated 1 year ago
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Penn ADS-B · @pennadsb
2 followers · 708 posts · Server airwaves.social
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Last updated 1 year ago
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· @Reina7365
0 followers · 1 posts · Server pawoo.net
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Last updated 1 year ago
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· @Chlohot9755
0 followers · 1 posts · Server pawoo.net
Open media

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Last updated 1 year ago
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· @Teodice
0 followers · 1 posts · Server pawoo.net

Anyone else farming Tier 5 that mind helping out? ❤️

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Last updated 1 year ago
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screwtape · @screwtape
372 followers · 5805 posts · Server mastodon.sdf.org

Hey, would I have anything to gain by doing this:
(with-open-file (io "file.ext" :direction :io)
(let* ((before (read-sequence (make-array (file-length io)) io)))
(file-position io :start)
(write-sequence *changed-sequence* io)
(unless (equal *changed-sequence* (read-sequence (make-array (file-length io)) io))
(error "write seems not to've happened"))))
;; the standard requires a lock on file writing already.

#commonlisp #programmingquestion #lisp #p

Last updated 1 year ago
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· @Chloehot9375
8 followers · 2 posts · Server pawoo.net
Open media

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*rn .p_

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Last updated 1 year ago
Original post

· @Chloehot9375
0 followers · 1 posts · Server pawoo.net
Open media

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Telegram: t.me/chloe_hot54

Session:05bf446c0daf60e9d68d27c54fc867f6346d395012bac74dd156bc5e59bd6a5e7c

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Last updated 1 year ago
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· @Heart965538
1 followers · 2 posts · Server pawoo.net
Open media

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Last updated 1 year ago
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