Using the theory of Weyl structures, we give a natural generalization of the notion of essential conformal structures and conformal Killing fields to arbitrary parabolic geometries. We show that a parabolic structure is inessential whenever the automorphism group acts properly on the base space. As a corollary of the generalized Ferrand–Obata theorem proved by C. Frances, this proves a generali...

At the very beginning of the 1990s, a student happened to use a pen in a pen plotter that was smaller than the required size to fit the holder, which produced squiggle line drawings very similar to hand-generated plots. Taking advantage of this “accidental” discovery, and so as to establish the impact of this “technique,” Van Bakergem and Obata decided to voluntarily use this particular process...

Ranked voting data arise when voters select and rank more than one candidate with an order of preference. Cook et al.[1] introduced data envelopment analysis (DEA) to analyze ranked voting data. Obata et al.[2] proposed a new method that did not use information obtained from inefficient candidates to discriminate efficient candidates. Liu et al.[3] ranked efficient DMUs on the DEA frontier with...

Keishi Miyata, Masafumi Nakayama, Koichi Kaikita, Toru Obata, Motohiro Takeya and Hisao Koichi Sugamura, Seigo Sugiyama, Toshimitsu Nozaki, Yasushi Matsuzawa, Yasuhiro Izumiya, Effects of Cannabinoid 1 Receptor Blockade on Macrophages Activated Endocannabinoid System in Coronary Artery Disease and Antiinflammatory Print ISSN: 0009-7322. Online ISSN: 1524-4539 Copyright © 2008 American Heart Ass...

s of 33rd International Geological Congress, 6–14 August 2008, Oslo. Coltorti, M., Bonadiman, C., O’Reilly, S. Y., Griffin, W. L. & Pearson, N. J. 2010. Buoyant ancient continental mantle embedded in oceanic lithospheric (Sal Island, Cape Verde Archipelago). Lithos, doi: 10.1016/j.lithos.2009.11.005. Davies, G. R., Nixon, P. H., Pearson, D. G. & Obata, M. 1993. Tectonic implications of graphiti...

the aim of this note is to study the submajorization inequalities for $tau$-measurable operators in a semi-finite von neumann algebra on a hilbert space with a normal faithful semi-finite trace $tau$. the submajorization inequalities generalize some results due to zhang, furuichi and lin, etc..

In this paper, newly defined level operators and modal-like operators over extensional generalized intuitionistic fuzzy sets (GIFSB) are proposed. Some of the basic properties of the new operators are discussed.