Results 51 to 60 of about 242,259 (303)

Complete solutions of the simultaneous Pell equations $ (a^2+1)y^2-x^2 = y^2-bz^2 = 1 $

open access: yesAIMS Mathematics, 2021
In this paper, we consider the simultaneous Pell equations $ (a^2+1)y^2-x^2 = y^2-bz^2 = 1 $ where $ a > 0 $ is an integer and $ b > 1 $ is squarefree and has at most three prime divisors.
Changsheng Luo, Jiagui Luo
doaj   +1 more source

On New Polynomial Sequences Constructed to Each Vertex in an n-Gon

open access: yesDiscrete Dynamics in Nature and Society, 2022
In this work, we bring to light the properties of newly formed polynomial sequences at each vertex of Pell polynomial sequences placed clockwise at each vertex in the n-gon. We compute the relation among the polynomials with such vertices.
Abdul Hamid Ganie   +3 more
doaj   +1 more source

Complete solutions of the simultaneous Pell's equations $ (a^2+2)x^2-y^2 = 2 $ and $ x^2-bz^2 = 1 $

open access: yesAIMS Mathematics, 2023
In this paper, we consider the simultaneous Pell equations $ (a^2+2)x^2-y^2 = 2 $ and $ x^2-bz^2 = 1 $ where $ a $ is a positive integer and $ b > 1 $ is squarefree and has at most three prime divisors.
Cencen Dou, Jiagui Luo
doaj   +1 more source

On the discriminator of Lucas sequences. II

open access: yes, 2023
25 pages, 7 ...
Ferrari, ., Luca, F., Moree, P.
openaire   +3 more sources

Finite Element Modeling of Residual Stress Formation during Nanosecond Laser Ablation of Stainless Steel

open access: yesAdvanced Engineering Materials, EarlyView.
This article investigates residual stress formation during single‐spot nanosecond laser ablation of stainless steel. Experimental validation and a parametric study using finite element simulations are employed to analyze thermal effects, ablation dynamics, and stress evolution.
Yutaka Tsumura   +7 more
wiley   +1 more source

Magic numbers in the music of Sofia Gubaidulina [PDF]

open access: yesMuzikologija, 2002
Sofia Gubaidulina's compositions are characterized by a special kind of symbolism and constructivism both based on numbers, i.e. mathematical proportions. In almost all her works so-called numerical plots can be detected. The proportions of the Fibonacci
Tsenova Valeria
doaj   +1 more source

Toward Architected Microstructures Using Advanced Laser Beam Shaping in Laser Powder Bed Fusion of Ti‐6Al‐4V

open access: yesAdvanced Functional Materials, EarlyView.
This research applies advanced laser beam shaping (LCoS‐SLM) to fabricate the Ti‐6Al‐4V alloy via laser powder bed fusion. A tailored beam is used to prevent martensite formation and create a dual α+β microstructure by controlling cooling rates.
Reza Esmaeilzadeh   +8 more
wiley   +1 more source

On the Split Mersenne and Mersenne-Lucas Hybrid Quaternions

open access: yesمجلة بغداد للعلوم, 2023
In this communication, introduce the split Mersenne and Mersenne-Lucas hybrid quaternions, also obtaining generating functions and Binet formulas for these hybrid quaternions and investigating some properties among them.
B. Malini Devi, S. Devibala
doaj   +1 more source

Lucas sequence, its properties and generalisation [PDF]

open access: yes, 2013
Fibonacci AND Lucas sequences are most interesting among recurrent sequences.
Barik, Biswajit
core  

On harmonic numbers and Lucas sequences [PDF]

open access: yesPublicationes Mathematicae Debrecen, 2012
Harmonic numbers $H_k=\sum_{05 we have $$\sum_{k=0}^{p-1}u_{k+ }H_k/2^k=0 (mod p),$$ where $ =0$ if p=1,2,4,8 (mod 15), and $ =1$ otherwise.
openaire   +3 more sources

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