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8 votes
1 answer
240 views

Classification of formality morphisms for chains and Drinfel'd associators

In his 1997 preprint q-alg/9709040, M. Kontsevich proved constructively the existence of a $L_\infty$-quasi-isomorphism between the differential graded algebra structure on the deformation complex of …
6 votes
1 answer
310 views

Operad structure on Kontsevich's admissible graphs

In his celebrated 97' preprint q-alg/9709040, M. Kontsevich constructs a $L_\infty$-quasi-isomorphism $\mathcal U:\mathcal D_{\rm poly}\to\mathcal T_{\rm poly}$ between the differential graded algebra …
5 votes
0 answers
277 views

Higher Braces algebra and operads

1) In [HIGHER OPERATIONS ON HOCHSCHILD COMPLEX], Gerstenhaber and Voronov showed that the Hochschild complex $C_1(\mathcal A)$ of any associative algebra (or e_1 algebra) $\mathcal A$ is naturally end …
3 votes
0 answers
175 views

Generalisation of the notion of operad

An algebra (of the type encoded by $\mathscr P$) on the vector space $V$ is a morphism of operads $\mu:\mathscr P\to End_V$ with $End_V$ the endomorphism operad for $V$. … In other words, (if such generalisation of operads exists), the pair $(\rho,[\cdot,\cdot])$ would be described as a morphism $\mathscr P\to End_{\big((A,\cdot),(V,*)\big)}$ i.e. the right-hand side would …
3 votes
1 answer
241 views

A differential graded Lie algebra with the Hochschild differential

Let $(V,\cdot)$ be an associative algebra and $W$ be a vector space endowed with a bimodule structure $\triangleright:V\otimes W\to W$ and $\triangleleft:W\otimes V\to W$ such that the following relat …
4 votes
1 answer
266 views

3-Gerstenhaber algebra structure on the cohomology of deformation complexes?

In a seminal paper "On the Deformation of Rings and Algebras", M. Gerstenhaber showed that the deformation complex of any associative algebra (known as the Hochschild complex) is naturally endowed wit …
4 votes
1 answer
420 views

Formality of the little $n$-disks operad and deformation theory

In [Another proof of M. Kontsevich formality theorem], Tamarkin provides a proof of the formality of the differential graded Lie algebra controlling the deformation of a polynomial associative algebra …
3 votes
1 answer
359 views

Brace algebra structure on the Hochschild complex of an associative algebra

As shown by Gerstenhaber and Voronov [Higher operations on the Hochschild complex], the Hochschild complex of an associative algebra is endowed with a natural structure of brace algebra. The first bra …