Results 21 to 30 of about 923 (213)

Phase synchronized 6 Hz transcranial electric and magnetic stimulation boosts frontal theta activity and enhances working memory

open access: yesNeuroImage, 2021
Network-level synchronization of theta oscillations in the cerebral cortex is linked to many vital cognitive functions across daily life, such as executive functions or regulation of arousal and consciousness.
Tiam Hosseinian   +4 more
doaj   +1 more source

On Entry 8 of Chapter 19 of Ramanujan's Second Notebook [PDF]

open access: yesNotes on Number Theory and Discrete Mathematics
The aim of this paper is to give an alternative proof of Entry 8 of Chapter 19 of Ramanujan's Second Notebook. Further, we deduce certain modular equations of degree 5 as a consequence of Entry 8 of Chapter 19.
K. R. Vasuki, A. Darshan
doaj   +1 more source

Eisenstein Series Identities Involving the Borweins' Cubic Theta Functions

open access: yesJournal of Applied Mathematics, 2012
Based on the theories of Ramanujan's elliptic functions and the (p, k)-parametrization of theta functions due to Alaca et al. (2006, 2007, 2006) we derive certain Eisenstein series identities involving the Borweins' cubic theta functions with the help of
Ernest X. W. Xia, Olivia X. M. Yao
doaj   +1 more source

Effective Congruences for Mock Theta Functions

open access: yesMathematics, 2013
Let M(q) = ∑c(n) qn be one of Ramanujan’s mock theta functions. We establish the existence of infinitely many linear congruences of the form: c(An + B) ≡ 0 (mod lj) where A is a multiple of l and an auxiliary prime, p.
Heidi Goodson   +3 more
doaj   +1 more source

Theta Functions on the Theta Divisor

open access: yesRocky Mountain Journal of Mathematics, 2010
We show that the gradient and the hessian of the Riemann theta function in dimension n can be combined to give a theta function of order n+1 and modular weight (n+5)/2 defined on the theta divisor. It can be seen that the zero locus of this theta function essentially gives the ramification locus of the Gauss map.
openaire   +4 more sources

Some New θ-I-Locally Closed sets with Respect to an Ideal Topological Spaces

open access: yesRatio Mathematica, 2023
In this paper, we introduce the new notions called \breve{\mathbit{\theta}}-\mathbf{I}-locally closed sets, \breve{\mathbit{\theta}}-\mathbf{I}-locally closed sets and \breve{\mathbit{\theta}}-\mathbf{I}-closed functions and investigated their properties
M Vijayasankari, G Ramkumar
doaj   +1 more source

μ-theta functions [PDF]

open access: yesPacific Journal of Mathematics, 1982
Let A be an abelian, nilpotent finite dimensional algebra over R. Let B((.),(.)) be a symmetric, bilinear form on A which satisfies B(xy,w) = B(y,xw). Define ((.))--the scalar log function on A by (DIAGRAM, TABLE OR GRAPHIC OMITTED.PLEASE SEE DAI) It is shown that the Fourier transform of exp2(pi)i(sigma) (x), for (sigma) a rational member is (sigma)('-
openaire   +2 more sources

Some theorems on the explicit evaluation of Ramanujan's theta-functions

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2004
Bruce C. Berndt et al. and Soon-Yi Kang have proved many of Ramanujan's formulas for the explicit evaluation of the Rogers-Ramanujan continued fraction and theta-functions in terms of Weber-Ramanujan class invariants.
Nayandeep Deka Baruah, P. Bhattacharyya
doaj   +1 more source

Donaldson-Witten theory and indefinite theta functions

open access: yesJournal of High Energy Physics, 2017
We consider partition functions with insertions of surface operators of topologically twisted N=2 $$ \mathcal{N}=2 $$, SU(2) supersymmetric Yang-Mills theory, or Donaldson-Witten theory for short, on a four-manifold.
Georgios Korpas, Jan Manschot
doaj   +1 more source

Cholinergic Regulation of Hippocampal Theta Rhythm

open access: yesBiomedicines, 2022
Cholinergic regulation of hippocampal theta rhythm has been proposed as one of the central mechanisms underlying hippocampal functions including spatial memory encoding.
Zhenglin Gu, Jerrel L. Yakel
doaj   +1 more source

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