Results 161 to 170 of about 677,938 (298)
A Sharper Ramsey Theorem for Constrained Drawings
Journal of Graph Theory, EarlyView.ABSTRACT Given a graph G $G$ and a collection C ${\mathscr{C}}$ of subsets of Rd ${{\mathbb{R}}}^{d}$ indexed by the subsets of vertices of G $G$, a constrained drawing of G $G$ is a drawing where each edge is drawn inside some set from C ${\mathscr{C}}$, in such a way that nonadjacent edges are drawn in sets with disjoint indices.
Pavel Paták
wiley +1 more source
Multiplicative bijections between algebras of differentiable functions [PDF]
Ann. Acad. Sci. Fenn. Math. 32 (2007) 471-480, 2006 We show that any multiplicative bijection between the algebras of differentiable functions, defined on differentiable manifolds of positive dimension, is an algebra isomorphism, given by composition with a unique diffeomorphism.
arxiv
Survive the economic downturn: Operating flexibility, productivity, and stock crash
Journal of Operations Management, EarlyView.Abstract Operating flexibility supports a firm's resilience strategy during challenging times by enabling them to promptly cut down operating costs associated with unproductive resources. We employ a real options model to formalize this insight. Our empirically grounding analytics motivate a firm‐level proxy for downscale operating flexibility (FLEX ...
Yang Li +3 more
wiley +1 more source
Differential geometry of the q-quaternion [PDF]
Balkan Phys. Lett. 11 (2003), 91-101, 2001 Differential calculus on the quantum quaternionic group GL(1,H$_q$) is introduced.
arxiv
Journal of Plant Nutrition and Soil Science, EarlyView.ABSTRACT Background During the last decades, gamma spectrometry data have increasingly been used in soil science, for example, for mapping. However, the full data potential could not be exploited due to certain constraints, among which the insufficient representation of attenuating materials (in particular, water) in correction algorithms is the most ...
Ludger Herrmann, Georg Zimmermann
wiley +1 more source
Reflections on the Spatial Exponential Growth of Electromagnetic Quasinormal Modes
Laser &Photonics Reviews, EarlyView.Quasinormal modes (QNMs) offer a robust framework for understanding the physics of resonators. However, conceptual challenges arise in regions distant from resonators, where QNM fields exponentially grow. This growth is not unphysical, but gives rise to counterintuitive effects, which is explained by examining fundamentals of non‐Hermitian systems ...
Tong Wu +2 more
wiley +1 more source
Differential Algebra and Differential Geometry [PDF]
Advanced Studies in Pure Mathematics, 2019 openaire +2 more sources
Mori dream bonds and C∗${\mathbb {C}}^*$‐actions
Mathematische Nachrichten, EarlyView.Abstract We construct a correspondence between Mori dream regions arising from small modifications of normal projective varieties and C∗${\mathbb {C}}^*$‐actions on polarized pairs which are bordisms. Moreover, we show that the Mori dream regions constructed in this way admit a chamber decomposition on which the models are the geometric quotients of ...
Lorenzo Barban +3 more
wiley +1 more source
Medical Physics, EarlyView.Abstract Background The success of embolization, a minimally invasive treatment of liver cancer, could be evaluated in the operational room with cone‐beam CT by acquiring a dynamic perfusion scan to inspect the contrast agent flow. Purpose The reconstruction algorithm must address the issues of low temporal sampling and higher noise levels inherent in ...
Hana Haseljić +8 more
wiley +1 more source