Abstract
Motivated by the notion of
Funding statement: The second author was supported by “National Group for Algebraic and Geometric Structures, and their Applications” (GNSAGA – INDAM).
Acknowledgements
The paper was written while the second author was visiting the Scuola Normale Superiore. He is grateful to the first author for his kind hospitality. The authors thank A. Naor and D. Zaev for useful bibliographical information.
References
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