Results 31 to 40 of about 37,514 (226)

Homological Relations Between Graphic-Geometric Descriptive / Projective Models. Principle of Virtual Works in Descriptive Geometry

img journal, 2021
The concept of the model is vast and complex and in its scientific and empirical implications and applications or on an experimental basis refers to various disciplines and knowledge.
Andrea Donelli
doaj   +1 more source

On Angular Measures in Axiomatic Euclidean Planar Geometry

Measurement Science Review, 2022
We address the issue of angular measure, which is a contested issue for the International System of Units (SI). We provide a mathematically rigorous and axiomatic presentation of angular measure that leads to the traditional way of measuring a plane ...
Grötschel Martin, Hanche-Olsen Harald, Holden Helge, Krystek Michael P.   +3 more
doaj   +1 more source

Geometric transformations in school geometry

Lietuvos Matematikos Rinkinys
The study delves into the learning progression for school geometry based on transformations proposed by Hung-Hsi Wu. Plane transformations – translations, reflections, rotations, and dilations – are considered.
Rimas Norvaiša
doaj   +3 more sources

The congruence xⁿ≡-aⁿ(mod m) : Solvability and related OEIS sequences [PDF]

Notes on Number Theory and Discrete Mathematics
We study the solvability of the congruence xⁿ≡-aⁿ(mod m), where n,m∈ℤ+, a∈ℤ, and gcd(a,m)=1. Our motivation arises from computer experiments concerning a geometric property of the roots of the congruence xⁿ+yⁿ≡0(mod p), where n∈ℤ+ and p∈ℙ.
Jorma K. Merikoski, Pentti Haukkanen, Timo Tossavainen   +2 more
doaj   +1 more source

Selfdual spaces with complex structures, Einstein-Weyl geometry and geodesics [PDF]

, 1999
We study the Jones and Tod correspondence between selfdual conformal 4-manifolds with a conformal vector field and abelian monopoles on Einstein-Weyl 3-manifolds, and prove that invariant complex structures correspond to shear-free geodesic congruences ...
Calderbank, David M. J., Pedersen, H.
core   +5 more sources

Static Observers in Curved Spaces and Non-inertial Frames in Minkowski Spacetime [PDF]

, 2010
Static observers in curved spacetimes may interpret their proper acceleration as the opposite of a local gravitational field (in the Newtonian sense).
C. Misner, C.-G. Huang, C.-G. Huang, D. Alba, D. Alba, D. Bini, D. Bini, D.J. McManus, E. Minguzzi, E. Minguzzi, E. Minguzzi, F. Dahia, G. Longhi, J.R. Letaw, K. Marzlin, L.G. Jensen, M. Pauri, M.A. Abramowicz, M.P. do Carmo, P. J. Felix da Silva, P.J.F. Silva da, R. Wald, S. Carroll, S. Gao, S. Sonego, S.S. Seahra, W. Rindler   +26 more
core   +1 more source

Numerical simulations and observations of the role of katabatic winds in the creation and maintenance of Scharffenbergbotnen blue ice area, Antarctica [PDF]

The Cryosphere, 2015
We model the role of katabatic winds in the formation and maintenance of a blue ice area in Scharffenbergbotnen valley, Antarctica, using the finite element code Elmer.
T. Zwinger, T. Malm, M. Schäfer, R. Stenberg, J. C. Moore   +4 more
doaj   +1 more source

Complete intersection singularities of splice type as universal abelian covers [PDF]

, 2004
It has long been known that every quasi-homogeneous normal complex surface singularity with Q-homology sphere link has universal abelian cover a Brieskorn complete intersection singularity.
Eisenbud, Hartshorne, Jonathan Wahl, Luengo-Velasco, Neumann, Neumann, Reid, Walter D Neumann   +7 more
core   +5 more sources

On the relation of congruence in finite geometries

MATHEMATICA SCANDINAVICA, 1957
Paul Kustaanheimo
openaire   +6 more sources

Causal Geometry

Entropy, 2020
Information geometry has offered a way to formally study the efficacy of scientific models by quantifying the impact of model parameters on the predicted effects. However, there has been little formal investigation of causation in this framework, despite
Pavel Chvykov, Erik Hoel
doaj   +1 more source