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@cdarwin@c.im
2025-06-20 16:58:08

Leo Varadkar, who stood down as taoiseach in April 2024,
said he did not think a date should be fixed for an Irish unity referendum
as nationalists did not yet have the numbers to win.
But he said planning for a united Ireland should take place.
"I don't think a united Ireland is inevitable, I think it's something that we have to work towards," he said.
"But I think there are a lot of factors that would suggest that we're on that traje…

Leo Varadkar says Nigel Farage as PM would move Irish unity 'centre stage'
The former Irish prime minister says planning should take place for the possibility of Irish unification.

@arXiv_mathCO_bot@mastoxiv.page
2025-06-18 09:19:44

Distinguishing finite and infinite trees of arbitrary cardinality
Wilfried Imrich, Rafa{\l} Kalinowski, Florian Lehner, Monika Pl\'sniak, Marcin Stawiski
arxiv.org/abs/2506.14402

Distinguishing finite and infinite trees of arbitrary cardinality
Let $G$ be a finite or infinite graph and $m(G)$ the minimum number of vertices moved by the non-identity automorphisms of $G$. We are interested in bounds on the supremum $Δ(G)$ of the degrees of the vertices of $G$ that assure the existence of vertex colorings of $G$ with two colors that are preserved only by the identity automorphism, and, in particular, in the number $a(G)$ of such colorings that are mutually inequivalent. For trees $T$ with finite $m(T)$ we obtain the bound $Δ(T)\leq2^…

@arXiv_econEM_bot@mastoxiv.page
2025-06-18 08:40:53

High-Dimensional Spatial-Plus-Vertical Price Relationships and Price Transmission: A Machine Learning Approach
Mindy L. Mallory, Rundong Peng, Meilin Ma, H. Holly Wang
arxiv.org/abs/2506.13967

High-Dimensional Spatial-Plus-Vertical Price Relationships and Price Transmission: A Machine Learning Approach
Price transmission has been studied extensively in agricultural economics through the lens of spatial and vertical price relationships. Classical time series econometric techniques suffer from the "curse of dimensionality" and are applied almost exclusively to small sets of price series, either prices of one commodity in a few regions or prices of a few commodities in one region. However, an agrifood supply chain usually contains several commodities (e.g., cattle and beef) and spans numerous re…

@vosje62@mastodon.nl
2025-06-12 01:13:40

Grens tussen Gibraltar en Spanje verdwijnt, Britse apenrots wordt deel van Europese markt | de #Volkskrant
volkskran…

Grens tussen Gibraltar en Spanje verdwijnt, Britse apenrots wordt deel van Europese markt
Het was het laatste rafelrandje van de Brexit: de status van Gibraltar, een stukje Brits grondgebied aan de Spaanse zuidkust. Een nieuw akkoord regelt dat de grenscontroles tussen Spanje en Gibraltar binnenkort verleden tijd zijn.

@leftsidestory@mstdn.social
2025-05-18 00:30:02

Alley Stories III 🔣
巷弄故事 III 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

### Image 1: **English:** A black and white photograph of a brick wall with a convex mirror attached to it. The mirror reflects a street scene, including a portion of a road and some indistinct buildings. The wall shows signs of wear and aging, with visible cracks and discoloration. **Chinese:** 一张黑白照片，展示了一面砖墙，墙上安装有一个凸面镜。镜子反射出街道的景象，包括部分道路和一些模糊的建筑物。墙面显示出磨损和老化的迹象，有明显的裂缝和变色。
**English:** A black and white photograph of a wooden fence partially covered by climbing plants. The fence has some Chinese characters written on it. The plants cast shadows on the fence, creating a pattern of light and dark areas. **Chinese:** 一张黑白照片，展示了一道部分被攀援植物覆盖的木制围栏。围栏上写有一些汉字。植物在围栏上投下阴影，形成了明暗相间的图案。
**English:** A black and white photograph of a bamboo fence. The bamboo stalks are arranged vertically, creating a dense and uniform pattern. The shadows of the bamboo stalks add texture to the image. **Chinese:** 一张黑白照片，展示了一道竹制围栏。竹子竿垂直排列，形成了一个密集而均匀的图案。竹子的阴影为图像增添了质感。
**English:** A black and white photograph depicting a courtyard with a stone or concrete surface. In the center of the courtyard stands a stone pillar topped with a cylindrical stone. The ground is scattered with small debris. The courtyard is enclosed by high walls made of concrete or stone. **Chinese:** 一张黑白照片，展示了一个铺有石头或混凝土地面的庭院。庭院中央有一个带圆柱形顶部的石柱。地面上散落着小碎片。庭院的四周是由混凝土或石头筑成的高墙。

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@arXiv_physicsfludyn_bot@mastoxiv.page
2025-06-17 12:01:53

Dynamics of Vortex Clusters on a Torus
Aswathy K R, Udaya Maurya, Surya Teja Gavva, Rickmoy Samanta
arxiv.org/abs/2506.13158

Dynamics of Vortex Clusters on a Torus
We investigate the collective dynamics of multivortex assemblies in a two dimensional (2D) toroidal fluid film of distinct curvature and topology. The incompressible and inviscid nature of the fluid allows a Hamiltonian description of the vortices, along with a self-force of geometric origin, arising from the standard Kirchhoff-Routh regularization procedure. The Hamiltonian dynamics is constructed in terms of $q$-digamma functions $Ψ_q(z)$, closely related to the Schottky-Klein prime function…

@arXiv_mathCO_bot@mastoxiv.page
2025-06-17 11:05:14

A note on the second-largest number of dissociation sets in connected graphs
Pingshan Li, Ke Yang, Wei Jin
arxiv.org/abs/2506.12740 …

A note on the second-largest number of dissociation sets in connected graphs
A subset of vertices is called a dissociation set if it induces a subgraph with vertex degree at most one. Recently, Yuan et al. established the upper bound of the maximum number of dissociation sets among all connected graphs of order n and characterized the corresponding extremal graphs.They also proposed a question regarding the second-largest number of dissociation sets among all connected graphs of order n and the corresponding extremal graphs. In this paper, we give a positive answer to t…

@arXiv_csCC_bot@mastoxiv.page
2025-06-17 09:18:31

Monitoring graph edges via shortest paths: computational complexity and approximation algorithms
Giordano Colli
arxiv.org/abs/2506.12021

Monitoring graph edges via shortest paths: computational complexity and approximation algorithms
Edge-Geodetic Sets play a crucial role in network monitoring and optimization, wherein the goal is to strategically place monitoring stations on vertices of a network, represented as a graph, to ensure complete coverage of edges and mitigate faults by monitoring lines of communication. This paper illustrates and explores the Monitoring Edge-Geodetic Set (MEG-set) problem, which involves determining the minimum set of vertices that need to be monitored to achieve geodetic coverage for a given ne…

@arXiv_mathCO_bot@mastoxiv.page
2025-06-18 09:29:53

Transparent Rectangle Visibility Graphs
Chaipattana Juntarapomdach, Teeradej Kittipassorn
arxiv.org/abs/2506.14522 ar…

Transparent Rectangle Visibility Graphs
A transparent rectangle visibility graph (TRVG) is a graph whose vertices can be represented by a collection of non-overlapping rectangles in the plane whose sides are parallel to the axes such that two vertices are adjacent if and only if there is a horizontal or vertical line intersecting the interiors of their rectangles. We show that every threshold graph, tree, cycle, rectangular grid graph, triangular grid graph and hexagonal grid graph is a TRVG. We also obtain a maximum number of edge…

@leftsidestory@mstdn.social
2025-05-18 00:30:02

Alley Stories III 🔣
巷弄故事 III 🔣
📷 Nikon FE
🎞️Ilford FP4 Plus, expired 1994
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

### Image 1: **English:** A black and white photograph of a brick wall with a convex mirror attached to it. The mirror reflects a street scene, including a portion of a road and some indistinct buildings. The wall shows signs of wear and aging, with visible cracks and discoloration. **Chinese:** 一张黑白照片，展示了一面砖墙，墙上安装有一个凸面镜。镜子反射出街道的景象，包括部分道路和一些模糊的建筑物。墙面显示出磨损和老化的迹象，有明显的裂缝和变色。
**English:** A black and white photograph of a wooden fence partially covered by climbing plants. The fence has some Chinese characters written on it. The plants cast shadows on the fence, creating a pattern of light and dark areas. **Chinese:** 一张黑白照片，展示了一道部分被攀援植物覆盖的木制围栏。围栏上写有一些汉字。植物在围栏上投下阴影，形成了明暗相间的图案。
**English:** A black and white photograph of a bamboo fence. The bamboo stalks are arranged vertically, creating a dense and uniform pattern. The shadows of the bamboo stalks add texture to the image. **Chinese:** 一张黑白照片，展示了一道竹制围栏。竹子竿垂直排列，形成了一个密集而均匀的图案。竹子的阴影为图像增添了质感。
**English:** A black and white photograph depicting a courtyard with a stone or concrete surface. In the center of the courtyard stands a stone pillar topped with a cylindrical stone. The ground is scattered with small debris. The courtyard is enclosed by high walls made of concrete or stone. **Chinese:** 一张黑白照片，展示了一个铺有石头或混凝土地面的庭院。庭院中央有一个带圆柱形顶部的石柱。地面上散落着小碎片。庭院的四周是由混凝土或石头筑成的高墙。

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Folgen Sie dem Link PayPal.Me/dingsterdingster und geben Sie den Betrag ein. Es ist bequem und sicher. Sie haben noch kein PayPal-Konto? Kein Problem.