Tootfinder

from my link log —
Elementary functions NOT following the IEEE 754 floating-point standard.
http://www.hlsl.co.uk/blog/2020/1/29/ieee754-is-not-followed
saved 2025-02-11

Elementary Functions and NOT Following the IEEE 754 Floating-Point Standard — TRYING TO FIND THE OBVIOUS
The IEEE-754 Standard for floating-point numbers was introduced initially in 1985 to solve the problem of diverse floating point implementations prevent code being portable and increase stability across platforms. It has been widely adopted and revised over the last 30 years and if you have dealt

On isomorphisms of semi-free Hamiltonian $S^1$-manifolds and fixed point data
Liat Kessler, Nikolas Wardenski
https://arxiv.org/abs/2505.14000 https://

On isomorphisms of semi-free Hamiltonian $S^1$-manifolds and fixed point data
Following Gonzales, we answer the question of whether the isomorphism type of a semi-free Hamiltonian $S^1$-manifold of dimension six is determined by certain data on the critical levels. We first give counter examples showing that Gonzales' assumptions are not sufficient for a positive answer. Then we prove that it is enough to further assume that the reduced spaces of dimension four are symplectic rational surfaces and the interior fixed surfaces are restricted to at most one level. The addit…

Pandemic-era slump in ivory and pangolin scale trafficking persists, report finds https://news.mongabay.com/2025/06/pandemic-era-slump-in-ivory-and-pangolin-scale-trafficking-persists-report-finds/

Pandemic-era slump in ivory and pangolin scale trafficking persists, report finds
A recent report surveying seizures of pangolin scales and elephant ivory over the past decade has found a sharp decline following the COVID-19 pandemic. Using data from media reports, public documents, and criminal intelligence and investigations, analysts at the Wildlife Justice Commission (WJC) found authorities seized more than 370 metric tons of pangolin scales and […]

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Optimal alignment of Lorentz orientation and generalization to matrix Lie groups
Congzhou M Sha
https://arxiv.org/abs/2506.14994 https://

Optimal alignment of Lorentz orientation and generalization to matrix Lie groups
There exist elegant methods of aligning point clouds in $\mathbb R^3$. Unfortunately, these methods rely on the positive definite property of the Euclidean metric, and do not easily extend to the indefinite Minkowski metric. In this paper, we propose two solutions to the following problem: given inertial reference frames $A$ and $B$, and given (possibly noisy) measurements of a set of 4-vectors $\{v_i\}$ made in those reference frames with components $\{v_{A,i}\}$ and $\{v_{B,i}\}$, find the op…

Sometimes you look at a graph and think that a particular value seems a bit odd. Then you look at the other numbers and they seem off, too. At that point, you realise that the graph is not intended to clarify, but to obscure. On German #EV charging prices, Quartets and diesel.

Sometimes you look at a graph and think that a particular value seems a… | Jaap Burger
Sometimes you look at a graph and think that a particular value seems a bit odd. Then you look at the other numbers and they seem off, too. At that point, you realise that the graph is not intended to clarify, but to obscure. Thank you, Felix Hamer, for drawing attention to this recent slide from BDEW Bundesverband der Energie- und Wasserwirtschaft e.V. The title suggests that EV charging would only cost the same as filling up a diesel or petrol car for the same distance in an 'Extremszenario…

Check out my latest CSO piece, which examines how Trump’s nominees for national cyber director and CISA director will face shared challenges but different prospects in coping with unprecedented reductions in cyber personnel across the federal government.
Many thanks to Michael Daniel of the Cyber Threat Alliance and Mark Montgomery of FDD for their help and insight.
Daniel made a point about Trump's cutbacks on cyber spending, a situation that most cyber folks haven't see…

Top US cyber officials face divergent paths after Senate confirmation
Following their Senate confirmations, Sean Cairncross and Sean Plankey — Trump’s nominees for national cyber director and CISA director — will face shared challenges but different prospects in coping with unprecedented reductions in cyber personnel across the federal government.

@… I’m curious how you’re feeling about how this has panned out one year on. I watched that keynote with a sinking heart.

The stochastic heat inclusion with fractional time driven by time-space Brownian and L\'evy white noise
Olfa Draouil, Rahma Yasmina Moulay Hachemi, Bernt {\O}ksendal
https://arxiv.org/abs/2506.08275

The stochastic heat inclusion with fractional time driven by time-space Brownian and Lévy white noise
We study a time-fractional stochastic heat inclusion driven by additive time-space Brownian and Lévy white noise. The fractional time derivative is interpreted as the Caputo derivative of order $α\in (0,2).$ We show the following: \\ a) If a solution exists, then it is a fixed point of a specific set-valued map.\\ b) Conversely, any fixed point of this map is a solution of the heat inclusion.\\ c) Finally, we show that there is at least one fixed point of this map, thereby proving that there …

Analytic model for neutral penetration and plasma fueling
George J. Wilkie
https://arxiv.org/abs/2506.10906 https://arxiv.org/pdf/250…

Analytic model for neutral penetration and plasma fueling
Neutral atoms recycled from wall interaction interact with confined plasma, thereby refueling it, most strongly in the region closest to the wall. This occurs near the X-point in diverted configurations, or else near the wall itself in limited configurations. A progression of analytic models are developed for neutral density in the vicinity of a planar or linear source in an ionizing domain. First-principles neutral transport simulations with DEGAS2 are used throughout to test the validity and …