Výsledky vyhledávání - "Hitoshi Kaneta"

On Arcs and Curves with Many Automorphisms

Autor: Fernanda Pambianco, Hitoshi Kaneta, Stefano Marcugini

Publikováno v: Mediterranean Journal of Mathematics. 2:71-102

We construct highly symmetric arcs by using highly symmetric curves: the Klein quartic which is the most symmetric non-singular curve of degree 4, and the Wiman sextic which is shown to be the unique A6-invariant curve of degree 6. The set of flexes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8247687a1dc982005b842fda6ff4dd0a
https://doi.org/10.1007/s00009-005-0031-0

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Autor: Fernanda Pambianco, Hitoshi Kaneta, Stefano Marcugini

Publikováno v: Geometriae Dedicata. 85:317-334

If n is an odd prime less than 20, then the most symmetric nonsingular plane curves in P 2 of degree n are projectively equivalent to the Fermat curve x n +y n +z n .

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https://doi.org/10.1023/a:1010362623683

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Classification of extremal double-circulant self-dual codes of length up to 62

Autor: T. Aaron Gulliver, Masaaki Harada, Hitoshi Kaneta

Publikováno v: Discrete Mathematics. 188:127-136

All distinct extremal double-circulant self-dual codes of length up to 62 have been found by exhaustive search. These codes are classified in this paper using new and previously known methods. Several of these codes are new extremal self-dual codes.

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https://doi.org/10.1016/s0012-365x(97)00250-1

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Classical arcs in PG(r, q) for 11 ⩽ q ⩽ 19

Autor: Hitoshi Kaneta, J. M. Chao

Publikováno v: Discrete Mathematics. 174(1-3):87-94

The largest arcs in PG(r, q) have length q + 1 and they are classical, if 11 ⩽ q ⩽ 19, q ≠ 16 and 1 ⩽ r ⩽ q − 2 or if q = 16 and 4 ⩽ r ⩽ q − 5.

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On the uniqueness of (q + 1)-arcs of PG (5, q), q = 2h, h ≥ 4

Autor: Hitoshi Kaneta, Tatsuya Maruta

Publikováno v: Mathematical Proceedings of the Cambridge Philosophical Society. 110:91-94

Throughout this paper q = 2h with h ≥ 4, and PG(r, q) stands for the r-dimensional projective space over the finite field GF(q) with q elements.

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https://doi.org/10.1017/s0305004100070146

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Automorphism groups of vector groups over a field of positive characteristic

Autor: Takefumi Tanaka, Hitoshi Kaneta

Publikováno v: Hiroshima Math. J. 38, no. 3 (2008), 437-446

We define elementary automorphisms of the $n$-dimentional vector group over an algebraically closed field of positive characteristic and show that they generate the automorphism group of the vector group. We also give a necessary and sufficient compu

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https://doi.org/10.32917/hmj/1233152780

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The Most Symmetric Non-Singular Plane Curves

Autor: Stefano Marcugini, Fernanda Pambianco, Hitoshi Kaneta

Publikováno v: Proceedings of the Second ISAAC Congress ISBN: 9781461379713

Throughout this paper k stands for the complex number field ℂ. A homogeneous polynomial f (x 1,x 2,..., x r+1) ∈ k[x 1, x 2,…, x r+1] defines an algebraic set f = 0, or V(f) in the r-dimensional projective space pr. A non-singular matrix A ∈

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90dd28610a44995f0e3970ee5d67efd2
https://doi.org/10.1007/978-1-4613-0271-1_19

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Irreducibility of some unitary representations of the Poincaré group with respect to the Poincaré subsemigroup, III

Autor: Hitoshi Kaneta

Publikováno v: Nagoya Mathematical Journal. 87:175-225

The aim of this paper is to prove that irreducible unitary representations of the Poincaré group P = R4 × SSL(2, C) are reducible as the representations of the Poincaré subsemigroup P+ = V+ × SSL(2, C) with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::61ea5afb3d39712ed8a3eb77f07d30fa
https://doi.org/10.1017/s0027763000020018

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Irreducibility of some unitary representations of the poincaré group with respect to the Poincaré subsemigroup, II

Autor: Hitoshi Kaneta

Publikováno v: Nagoya Mathematical Journal. 87:147-174

Let P+(3) and P+(3) be the 3-dimensional space-time Poincaré group and the Poincaré subsemigroup, that is, P(3) = R3 × sSU(1, 1) and P+(3) = V+(3)=SSU(1, 1) where The multiplication is defined by the formula (x, g)(x′, g′) = (x + g*−1x′g�

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https://doi.org/10.1017/s0027763000020006

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On the Asymptotic Behaviour of a Diffusion Process with Singular Drift

Autor: Hitoshi Kaneta

Publikováno v: Nagoya Math. J. 57 (1975), 87-106

We discuss some peculiar features of the diffusion process whose characterization is given below. Let D be a bounded domain in the d-dimensional Euclidean space Ed with a smooth boundary ∂D. The domain D contains open balls (i = 1, · · ·, n) whi

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https://doi.org/10.1017/s0027763000016573

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