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Remarks on Hopf Images and Quantum Permutation Groups
$S_{n}^{+}$
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- Journal:
- Canadian Mathematical Bulletin / Volume 61 / Issue 2 / 01 June 2018
- Published online by Cambridge University Press:
- 20 November 2018, pp. 301-317
- Print publication:
- 01 June 2018
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- Article
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Motivated by a question of A. Skalski and P. M. Sołtan (2016) about inner faithfulness of S. Curran’s map of extending a quantum increasing sequence to a quantum permutation, we revisit the results and techniques of T. Banica and J. Bichon (2009) and study some group-theoretic properties of the quantum permutation group on points. This enables us not only to answer the aforementioned question in the positive for the case where
$n\,=\,4,\,k\,=\,2$, but also to classify the automorphisms of 
$S_{4}^{+}$, describe all the embeddings 
${{O}_{-1}}(2)\,\subset \,S_{4}^{+}$ and show that all the copies of 
${{O}_{-1}}(2)$ inside $S_{4}^{+}$are conjugate. We then use these results to show that the converse to the criterion we applied to answer the aforementioned question is not valid.
