Results 21 to 30 of about 27,372,603 (325)

Negative clean rings

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2022
A ring is called negative clean if the negative (i.e., the additive inverse) of each clean element is also clean. Clean rings are negative clean.
Călugăreanu Grigore, Pop Horia F.
doaj   +1 more source

On the Equivalence of Nonnegative Matrix Factorization and Spectral Clustering

SDM, 2005
Current nonnegative matrix factorization (NMF) deals with X = FG T type. We provide a systematic analysis and extensions of NMF to the symmetric W = HH T , and the weighted W = HSH T . We show that (1) W = HH T is equivalent to Kernel K -means clustering
C. Ding, Xiaofeng He
semanticscholar   +1 more source

Jacobsons Lemma fails for nil-clean 2 × 2 integral matrices

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2020
We show that for two 2 × 2 integral matrices A, B, if the product AB is nil-clean then BA may not be nil-clean. Despite the fact that for many special cases, BA is also nil-clean, we finally found three counterexamples.
Călugăreanu Grigore, Pop Horia F.
doaj   +1 more source

Exact Results in N_c=2 IIB Matrix Model [PDF]

, 1997
We investigate N_c=2 case of IIB matrix model, which is exactly soluble. We calculate the partition function exactly and obtain a finite result without introducing any cut-off.
Suyama, T., Tsuchiya, A.
core   +2 more sources

Progress and understanding on geology-drilling engineering-mechanics coupling mechanism of ultra-deep directional wells [PDF]

Youqicang pingjia yu kaifa
Deep and ultra-deep oil and gas exploration and development are key strategic areas in China's energy sector, with ultra-deep directional drilling serving as a crucial technology for accessing these resources.
CHENG Hai,ZHANG Yiqun,WANG Yin,LIU Chao
doaj   +1 more source

2×2 operator matrix with real parameter and its spectrum [PDF]

E3S Web of Conferences
In the present paper we consider a linear bounded self-adjoint 2×2 block operator matrix Aμ (so called generalized Friedrichs model) with real parameter μ ∈ R.
Dilmurodov Elyor B., Tosheva Nargiza A., Turayeva Nabiya A., Karamatov Bolatbek T., Shokirova Durdona Sh.   +4 more
doaj   +1 more source

Beta ensembles, stochastic Airy spectrum, and a diffusion [PDF]

, 2006
We prove that the largest eigenvalues of the beta ensembles of random matrix theory converge in distribution to the low-lying eigenvalues of the random Schroedinger operator -d^2/dx^2 + x + (2/beta^{1/2}) b_x' restricted to the positive half-line, where ...
J. Ramírez, B. Rider, B. Virág
semanticscholar   +1 more source

Zero Modes in a $c = 2$ Matrix Model [PDF]

, 1993
Recently \REF\dk{Simon Dalley and Igor Klebanov,'Light Cone Quantization of the $c=2$ Matrix Model', PUPT-1333, hepth@xxx/920705} \refend Dalley and Klebanov proposed a light-cone quantized study of the $c=2$ matrix model, but which ignores $k^{+}=0 ...
Brezin, Burkardt, Burkardt, Curtright, Dirac, Douglas, Eller, Gross, Hanson, Harindranath, Heinzl, Heinzl, Hiller, Lenz, McCartor, Ovid C. Jacob, Pauli, Pauli, Perry, Swenson, Thorn   +20 more
core   +3 more sources

Ultra-superovulation for the CRISPR-Cas9-mediated production of gene-knockout, single-amino-acid-substituted, and floxed mice

Biology Open, 2016
Current advances in producing genetically modified mice using genome-editing technologies have indicated the need for improvement of limiting factors including zygote collection for microinjection and their cryopreservation.
Yoshiko Nakagawa, Tetsushi Sakuma, Norihisa Nishimichi, Yasuyuki Yokosaki, Noriyuki Yanaka, Toru Takeo, Naomi Nakagata, Takashi Yamamoto   +7 more
doaj   +1 more source

Graphs and Ideals Generated by Some 2-Minors [PDF]

, 2009
Let G be a finite graph on [n] = {1, 2,…, n}, X a 2 × n matrix of indeterminates over a field K, and S = K[X] a polynomial ring over K. In this article, we study about ideals I G of S generated by 2-minors [i, j] of X which correspond to edges {i, j} of ...
Masahiro Ohtani
semanticscholar   +1 more source