Results 21 to 30 of about 27,754,862 (345)
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.
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The 2+2-Signature and the 1+1-Matrix-Brane [PDF]
, 2006 We discuss different aspects of the 2+2-signature from the point of view of the quatl theory. In particular, we compare two alternative approaches to such a spacetime signature, namely the 1+1-matrix-brane and the 2+2-target spacetime of a string.
J. A. NIETO, Nieto J. A.
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Efficient gene delivery to photoreceptors using AAV2/rh10 and rescue of the Rhoâ/â mouse
Molecular Therapy: Methods & Clinical Development, 2015 As gene therapies for various forms of retinal degeneration progress toward human clinical trial, it will be essential to have a repertoire of safe and efficient vectors for gene delivery to the target cells.
Arpad Palfi +9 more
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Singular matrices that are products of two idempotents or products of two nilpotents
Special Matrices, 2021 Over commutative domains we characterize the singular 2 × 2 matrices which are products of two idempotents or products of two nilpotents. The relevant casees are the matrices with zero second row and the singular matrices with only nonzero entries.
Călugăreanu Grigore
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Matrix elements and duality for type 2 unitary representations of the Lie superalgebra gl(m|n) [PDF]
, 2015 The characteristic identity formalism discussed in our recent articles is further utilized to derive matrix elements of type 2 unitary irreducible $gl(m|n)$ modules. In particular, we give matrix element formulae for all gl(m|n) generators, including the
Gould, Mark D. +2 more
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Progress and understanding on geology-drilling engineering-mechanics coupling mechanism of ultra-deep directional wells [PDF]
Youqicang pingjia yu kaifaDeep 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
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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.
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On idempotent stable range 1 matrices
Special Matrices, 2022 We characterize the idempotent stable range 1, 2 × 2 matrices over commutative rings and in particular the integral matrices with this property. Several special cases and examples complete the subject.
Călugăreanu Grigore, Pop Horia F.
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2×2 operator matrix with real parameter and its spectrum [PDF]
E3S Web of ConferencesIn 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. +4 more
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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 +7 more
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