Results 81 to 90 of about 87,109 (183)
5,17-Diformyl-25,26,27,28-tetrapropoxycalix[4]arene
Acta Crystallographica Section E, 2013 The title compound, C42H48O6, was obtained via formylation of 25,26,27,28-tetrapropoxycalix[4]arene with dichloromethyl methyl ether and tin tetrachloride. It adopts a pinched cone conformation, which leads to an open cavity.
Xiaoqiang Sun +4 more
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2,3-Dicyano-4-[(4-methylphenylsulfonyl)oxy]phenyl 4-methylbenzenesulfonate
Acta Crystallographica Section E, 2011 In the title compound, C22H16N2O6S2, the dihedral angle formed by the mean planes of the two benzene rings of the 4-methylphenylsulfonate groups is 21.9 (1)° and these rings form dihedral angles of 48.26 (9) and 52.73& ...
Yanhua Deng, Changqin Ma, Xiaomei Zhang
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2-[(2-Acetoxybenzoyl)oxy]benzoic acid
Acta Crystallographica Section E, 2012 The title compound, C16H12O6, is a common impurity of ortho-acetylsalicylic acid (aspirin). The benzene rings form a dihedral angle of 81.9 (1)° while the acetyl and carboxyl groups form dihedral angles of 74.0 (1) and 26.4 ...
Katarzyna A. Solanko, Andrew D. Bond
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On some subgroup lattices of dihedral, alternating and symmetric groups
Discussiones Mathematicae - General Algebra and Applications, 2023 Vilas Kharat +2 more
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Structure of finite dihedral group algebra
Finite Fields and Their Applications, 2015 In this article, we show the relation between the irreducible idempotents of the cyclic group algebra $\mathbb F_qC_n$ and the central irreducible idempotents of the group algebras $\mathbb F_qD_{2n}$, where $\mathbb F_q$ is a finite field with $q$ elements and $D_{2n}$ is the dihedral group of order $2n$, where ${\rm gcd}(q,n)=1$.
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Sequencing the dihedral groups D4k
Discrete Mathematics, 1997 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Semigroup Forum, 1986 By the following simple formula (1) \(\forall x\exists y\) \((x=xyy\), \(y=xyx)\) we characterize semigroups from the title. Considering a local property of their \({\mathcal H}\)-classes we get bands and Boolean groups as extreme cases of semigroups with that property.
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The Harborth Constant of Dihedral Groups
, 2018 The Harborth constant of a finite group $G$, denoted $\gs(G)$, is the smallest integer $k$ such that the following holds: For $A\subseteq G$ with $|A|=k$, there exists $B\subseteq A$ with $|B|=\exp(G)$ such that the elements of $B$ can be rearranged into a sequence whose product equals $1_G$, the identity element of $G$. The Harborth constant is a well
Balachandran, Niranjan +2 more
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Orthomorphisms of dihedral groups
Discrete Mathematics, 1997 An orthomorphism \(\phi\) of a finite group \(G\) is a permutation of \(G\) such that the mapping \(x\mapsto x^{-1}\phi (x)\) is also a permutation. Orthomorphisms \(\phi_1,\phi_2\) of \(G\) are orthogonal if the mapping \(x\mapsto \phi_1(x)^{-1}\phi_2(x)\) is a permutation of \(G.\) Denote by \(\omega (G)\) the maximum cardinality of a set of pairwise
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SR-groups of Order 2npm with Dihedral Sylow 2-subgroup
Моделирование и анализ информационных систем, 2007 The structure of SR-groups with dihedral Sylow 2-subgroup modulo Frattini subgroup is described. It is proved that if a group О is a non-supersolvable SR-group of order 2npm with dihedral Sylow 2-subgroup, p is Mersenne prime.
V. V. Yanishevskiy
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