مصحف ابن مسعود کی تاریخی حیثیت کے بارے میں ابن وراق کی آراء کا تنقیدی جائزہ

This article deals with the polemics of Ibn Warraq about the history of the text of Qur’an with reference the codex of Abdullah bin Mas’ud. Ibn Warraq considers the codex of Ibn Mas’ud as milestone in the history of Qur’anic text. Ibn Warraq is of the view that its order of Sura is different from Mushaf Uthmani and a lot of variant reading have been attributed to him so the history of Qur’anic text and the text itself should be rearranged in the light of codex of Ibn Masud. In this paper these views being examined in the light of authentic sources.

Hermitian Geometry of Twistor Spaces

In the present thesis we investigate the almost Hermitian geometry of the twistor spaces of oriented Riemannian 4-manifolds. Holomorphic and orthogonal bisectional curvatures have been intensively explored on K ̈hler manifolds and a lot of important results have been obtained in this case. a But in the non-K ̈hler case these curvatures are not very well studied and it seems a that the main reason for that is the lack of interesting examples. The first part of the thesis is devoted to the study of the curvature properties of Atiyah-Hitchin- Singer and Eells-Salamon almost Hermitian structures. This is used to provide some interesting examples of almost Hermitian 6-manifolds of constant or strictly positive holomorphic, Hermitian and orthogonal bisectional curvatures. In the second part of the thesis we determine the Gray-Hervella classes of the so-called compatible almost Hermitian structures on the twistor spaces, recently in- troduced by G. Deschamps . The interest in determining these classes is motivated by the fact that the Gray-Hervella classification is a very useful tool in studying almost complex manifolds. Our results in this direction generalize the well known integrabil- ity theorems by Atiyah-Hitchin-Singer, Eells-Salamon and Deschamps and show that there is a close relation between the properties of the spectrum of the anti-self-dual Weyl tensor of an almost K ̈hler 4-manifold and the almost Hermitian geometry of a its twistor space.