منابع مشابه
5 M ar 2 00 7 QUANTUM GROUPS ACTING ON 4 POINTS
We classify the compact quantum groups acting on 4 points. These are the quantum subgroups of the quantum permutation group Q4. Our main tool is a new presentation for the algebra C(Q4), corresponding to an isomorphism of type Q4 ≃ SO−1(3). The quantum subgroups of Q4 are subject to a McKay type correspondence, that we describe at the level of algebraic invariants.
متن کاملUpper bounds on the solutions to n = p+m^2
ardy and Littlewood conjectured that every large integer $n$ that is not a square is the sum of a prime and a square. They believed that the number $mathcal{R}(n)$ of such representations for $n = p+m^2$ is asymptotically given by begin{equation*} mathcal{R}(n) sim frac{sqrt{n}}{log n}prod_{p=3}^{infty}left(1-frac{1}{p-1}left(frac{n}{p}right)right), end{equation*} where $p$ is a prime, $m$ is a...
متن کامل2 7 Ja n 19 98 On the cohomology of s l ( m + 1 , IR ) acting on differential operators and s l ( m + 1 , IR ) - equivariant symbol
On the cohomology of sℓ(m + 1, IR) acting on differential operators and sℓ(m + 1, IR)-equivariant symbol Abstract Let D k λµ (IR m) denote the space of differential operators of order ≤ k from the space of λ-densities of IR m into that of µ-densities and let S k δ (IR m) be the space of k-contravariant, symmetric tensor fields on IR m valued in the δ-densities, δ = µ − λ. Denote by sℓ m+1 the p...
متن کامل1 1 M ay 2 00 0 APPROXIMATELY FINITELY ACTING OPERATOR ALGEBRAS
−→ (Ak, φk) and the operator algebras A = lim −→ (Ak, φk) obtained as limits of direct sums of matrix algebras over E with respect to star-extendible homomorphisms. The invariants in the algebraic case consist of an additive semigroup, with scale, which is a right module for the semiring VE = Homu(E⊗K, E⊗K) of unitary equivalence classes of star-extendible homomorphisms. This semigroup is refer...
متن کاملar X iv : 0 71 0 . 31 19 v 2 [ m at h . G R ] 2 5 N ov 2 00 8 PRODUCT GROUPS ACTING ON MANIFOLDS
We analyse volume-preserving actions of product groups on Riemannian manifolds. To this end, we establish a new superrigidity theorem for ergodic cocycles of product groups ranging in linear groups. There are no a priori assumptions on the acting groups, except a spectral gap assumption on their action. Our main application to manifolds concerns irreducible actions of Kazhdan product groups. We...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Algebra
سال: 1995
ISSN: 0021-8693
DOI: 10.1006/jabr.1995.1043