Results 51 to 60 of about 5,571,269 (248)

Note on primitive permutation groups and a diophantine equation

Discrete Mathematics, 1980
AbstractIt is shown that there are no transitive rank 3 extensions of the projective linear groups H, PSL(m,q) ⩽ H ⩽ PFL(m,q), for any prime power q and integer m ⩽ 3. In the course of the proof the diophantine equation 5m + 11 = xp2, where m, x are positive integers, arose.
J. D. Henstridge, Cheryl E. Praeger
openaire   +2 more sources

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

Advanced Materials, EarlyView.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje, Wilson Henao, Tania Rodenas, Patricia Concepción, Virginia Pérez Dieste, Alexander Missyul, Giovanni Agostini, Gonzalo Prieto   +7 more
wiley   +1 more source

Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet

Advanced Materials, EarlyView.
Chiral graphene nanoribbons on a ferromagnetic gadolinium‐gold surface alloy display tunable spin and charge states at their termini. Atomic work function variations and exchange fields enabe transitions between singlet, doublet, and triplet configurations.
Leonard Edens, Francisco Romero‐Lara, Trisha Sai, Kalyan Biswas, Manuel Vilas‐Varela, Thomas Frederiksen, Diego Peña, Fabian Schulz, Jose Ignacio Pascual   +8 more
wiley   +1 more source

Computation of Pólya polynomials of primitive permutation groups [PDF]

Mathematics of Computation, 1981
An almost complete list of Pólya polynomials of all primitive permutation groups up to degree 20 has been computed. The number-theoretical interpretation of Pólya polynomials and van der Waerden’s test make this a good tool to find safe conjectures for determining the group of an equation. This work was encouraged and supported by Professor W.
openaire   +1 more source

On orbital partitions and exceptionality of primitive permutation groups [PDF]

Transactions of the American Mathematical Society, 2004
Let G G and X
Guralnick, R. M., Li, Cai Heng, Praeger, Cheryl E., Saxl, J.   +3 more
openaire   +2 more sources

Escaping the Scaling Relationships in Oxygen Reduction Catalysis: Implications for PEM Fuel Cells

Advanced Materials, EarlyView.
Escaping the scaling relationships of the oxygen reduction reaction is vital for hydrogen fuel cells. This outlook examines how interfacial heterogeneity, spanning the subsurface lattice, chemisorption layer, and near‐interface solvation volume, mechanistically decouples intermediate binding energetics.
Muhammad Bilal Wazir, Lourdes F. Vega, Maryam Khaleel   +2 more
wiley   +1 more source

Block-transitive Steiner t-designs and sporadic simple groups(区传递Steiner t-设计与散在单群)

Zhejiang Daxue xuebao. Lixue ban
The study of t-designs with certain highly symmetric properties and the classification of their automorphism groups is one of the important topics of algebraic combinatorics.
庞璇(PANG Xuan), 詹小秦(ZHAN Xiaoqin)   +1 more
doaj   +1 more source

Permutations which make transitive groups primitive [PDF]

Open Mathematics, 2009
Abstract In this article we look into characterizing primitive groups in the following way. Given a primitive group we single out a subset of its generators such that these generators alone (the so-called primitive generators) imply the group is primitive.
openaire   +3 more sources

Soft Skins With Reversible Thickness Morphing: Materials, Mechanisms, and Applications

Advanced Materials, EarlyView.
Evolution of electronic skin (e‐skin) technologies toward adaptive, multifunctional soft skins. Phase I highlights early rigid and discrete sensory interfaces. Phase II shows the transition toward flexible, stretchable, and large‐area e‐skin. Phase III captures the emergence of computational e‐skin.
Oliver Ozioko, Chiamaka Akah, Ravinder Dahiya   +2 more
wiley   +1 more source

Primitivity of Permutation Groups, Coherent Algebras and Matrices

Journal of Combinatorial Theory, Series A, 2002
The term ``primitive'' is used in many senses in algebra. In particular, a permutation group is primitive if it preserves no non-trivial equivalence relation; a coherent algebra (such as the centralizer algebra of a permutation group) is primitive if it does not contain the matrix of such a relation; and a real square matrix is primitive if some power ...
Gareth A. Jones, Mikhail H. Klin, Yossi Moshe   +2 more
openaire   +3 more sources