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Di Bawah Lindungan Ka'bah (Under the Protection of Ka'bah) is the 1938 debut novel of the Indonesian author Haji Abdul Malik Karim Amrullah (1908–1981). Written while the author worked in Medan as the editor of an Islamic weekly magazine, the novel follows the doomed romance of a young Minang couple from different social backgrounds.
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A good cover is an open cover in which all sets and all non-empty intersections of finitely-many sets are contractible (Petersen 2006). The concept was introduced by André Weil in 1952 for differentiable manifolds , demanding the U α 1 … α n {\displaystyle U_{\alpha _{1}\ldots \alpha _{n}}} to be differentiably contractible.