Orbit-profile invariance conjecture for Nichols algebras

From papers

Let (X,r)(X,r) be a finite non-degenerate indecomposable solution of the Yang–Baxter equation, and let WX,rW_{X,r} be the associated braided vector space. Define the orbit profile

ΦX,r=(l1,l2,l3,),\Phi_{X,r}=(l_1,l_2,l_3,\ldots),

where lnl_n is the number of orbits of the action generated by rr on X×XX\times X having nn elements. Suppose

dimB(WX,r)=m\dim \mathfrak{B}(W_{X,r})=m

(or GKdimB(WX,r)=m\operatorname{GKdim}\mathfrak{B}(W_{X,r})=m). If (Y,r)(Y,r') is any finite non-degenerate solution of the Yang–Baxter equation with

ΦX,r=ΦY,r,\Phi_{X,r}=\Phi_{Y,r'},

then dimB(WY,r)=m\dim \mathfrak{B}(W_{Y,r'})=m (or GKdimB(WY,r)=m\operatorname{GKdim}\mathfrak{B}(W_{Y,r'})=m) under some given conditions.

Orbit-profile invariance conjecture. Equality of the orbit profiles should preserve the stated dimension, or Gelfand–Kirillov dimension, under the conditions intended in the source.

The proposed principle would make orbit data a useful invariant in studying Nichols algebras associated with non-degenerate solutions of the Yang–Baxter equation. The supplied statement leaves the “given conditions” unspecified, and the source provides no resolution.

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Sources & referencesView supporting material

Primary source

Yuxing Shi, “Multinomial expansion and Nichols algebras associated to non-degenerate involutive solutions of the Yang-Baxter equation”, arXiv:2110.09280 (2022).

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