Correction to "Quaternionic Davis–Wielandt shell in a right quaternionic Hilbert space'', Ukrainian Mathematical Journal, vol. 75, No. 6, November, 2023 (Ukrainian original vol. 75, No. 6, June, 2023)

• Date: 2026
• Main Authors: Jeribi, Aref, Mahfoudhi, Kamel
• Format: Article
• Language: English
• Published: Institute of Mathematics, NAS of Ukraine 2026
• Online Access: https://umj.imath.kiev.ua/index.php/umj/article/view/9201
• Journal Title: Ukrains’kyi Matematychnyi Zhurnal

UDC 517.5 We correct a mistake made in the proof of Example 2.1. In fact $\langle T\phi,\phi\rangle_{\mathbb{H}}=0$ is not true in the case where $T=\begin{pmatrix}  \mathbf{q} & 0 \\0 & -\mathbf{q}\\\end{pmatrix}.$