Thakur's basis conjecture for positive-characteristic multiple zeta values

Let qq be the cardinality of the constant field, let kk be the coefficient field, and let ζA(s)\zeta_A(\mathfrak{s}) denote the positive-characteristic multiple zeta value indexed by s\mathfrak{s}. For a positive integer ww, let IwT\mathcal{I}^{\mathrm{T}}_w consist of all tuples s=(s1,,sr)Z>0r\mathfrak{s}=(s_1,\ldots,s_r)\in\mathbb{Z}_{>0}^r, with rr varying, such that wt(s)=w\operatorname{wt}(\mathfrak{s})=w, siqs_i\leq q for 1ir11\leq i\leq r-1, and sr<qs_r<q. Define

BwT={ζA(s)sIwT}.\mathcal{B}^{\mathrm{T}}_w=\{\zeta_A(\mathfrak{s})\mid\mathfrak{s}\in\mathcal{I}^{\mathrm{T}}_w\}.

Thakur's basis conjecture. The set BwT\mathcal{B}^{\mathrm{T}}_w is a basis of the kk-vector space Zw\mathcal{Z}_w.

The conjecture was proposed by Thakur in analogy with Hoffman's basis conjecture. The paper's abstract states that this conjecture is proved, and that Todd's dimension conjecture follows as a consequence.

Sources & referencesView supporting material

Primary source

Chieh-Yu Chang, Yen-Tsung Chen and Yoshinori Mishiba, “On Thakur's basis conjecture for multiple zeta values in positive characteristic”, arXiv:2205.09929 (2022).

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