TY - JOUR T1 - Necessary Condition for Vector-Valued Model Spaces to be Invariant Under Conjugation AU - Khan, Rewayat AU - Khan, Jamroz PY - 2019 DA - May JF - Journal of New Theory JO - JNT PB - Naim ÇAĞMAN WT - DergiPark SN - 2149-1402 SP - 1 EP - 4 IS - 28 LA - en AB - The $S^{*}$-invariant subspaces of the Hardy-Hilbert space $H^{2}(E)$ (where $E$ is finite dimensional Hilbert space of dimension greater than 1) on the unit disc is well known. In this study, we examine that, if $\Omega$ is a conjugation on $E$, and $\Theta$ an inner function, then there exist model spaces which are not invariant for the conjugation $C_{\Omega}:L^{2}(E)\longrightarrow L^{2}(E)$. Under what necessary condition the model spaces is mapped onto itself is under consideration. KW - Inner function KW - model spaces KW - conjugation CR - [1] J. A. Cima, W. T. Ross, The backward shift on the Hardy space. Mathematical Surveys and Monograps, Volume 79. Amer. Math. Soc. Providence, RI, 2000. MR 1761913. CR - [2] R. G. Douglas, Banach algebra techniques in operator theory , Graduate Texts in Mathematics, Volume 179, Springer-Verlag, New York, 1998. CR - [3] E. Fricain, J. Mashreghi, The theory of H(b) spaces. Volume 2, New Mathematical Monographs, Volume 21, Cambridge University Press, Cambridge, 2015. CR - [4] S. R. Garcia and M. Putinar, Complex symmetric operators and applications, Trans. Amer. Math. Soc. 358 (2006), 1285–1315. CR - [5] S. R. Garcia, Conjugation and Clark operators. Recent advances in operator-related function theory, Contemp. Math, Volume 393, Amer. Math. Soc Providence, RI, 2006, pp. 67-111. MR 2198373 (2007b:47073). CR - [6] S. R. Garcia, J. Mashreghi, W.T. Ross, Introduction to model spaces and their operators. Cambridge: Cambridge University Press. 2016. CR - [7] S. R. Garcia, Conjugation, the backward shift, and Toeplitz kernel. J. Operator Theory 54/2 (2005) 239-250. MR 2186351. UR - https://dergipark.org.tr/en/pub/jnt/issue//561330 L1 - https://dergipark.org.tr/en/download/article-file/709233 ER -