Manchester Literary and Philosophical Society

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منابع مشابه

Mathematical Proceedings of the Cambridge Philosophical Society

We study Einstein metrics on smooth compact 4-manifolds with an edge-cone singularity of specified cone angle along an embedded 2-manifold. To do so, we first derive modified versions of the Gauss–Bonnet and signature theorems for arbitrary Riemannian 4-manifolds with edge-cone singularities, and then show that these yield non-trivial obstructions in the Einstein case. We then use these integra...

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Avicenna and his literary

Abu Ali Hossein Ebn Abdullah Ben Ali Ben Sinna entitled as Shayhk-o-Rayeis in the East and well known in the west by the name of Avicenna was born in a place called Afsharneh near the city of Bokhara in 980 AD but resided in the city of Balkh. He was five years old when his father took him to the city of Bokhara to study Holy Quran where his extraordinary memory became apparent and he memorized...

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ژورنال

عنوان ژورنال: Scientific American

سال: 1879

ISSN: 0036-8733

DOI: 10.1038/scientificamerican04051879-2706csupp