General relativity for mathematicians - Sachs R.K., Wu H

Link: http://ul.to/fjm0p4wo

Introduction to Riemann surfaces - Springer George

Link: http://ul.to/qqh9m5os

Foundations of differentiable manifolds and Lie groups - WARNER F.W.

Foundations of Differentiable Manifolds and Lie Groups gives a clear, detailed, and careful development of the basic facts on manifold theory and Lie Groups. It includes differentiable manifolds, tensors and differentiable forms. Lie groups and homogenous spaces, integration on manifolds, and in addition provides a proof of the de Rham theorem via sheaf cohomology theory, and develops the local theory of elliptic operators culminating in a proof of the Hodge theorem. Those interested in any of the diverse areas of mathematics requiring the notion of a differentiable manifold will find this beginning graduate-level text extremely useful. TOC:1: Manifolds. 2: Tensor and Differential Forms. 3: Lie Groups. 4: Integration on Manifolds. 5: Sheaves, Cohomology, and the De Rahm Theorem. 6: The Hodge Theorem.

Link: http://ul.to/tp60w1uk

Differential Forms, A Complement To Vector Calculus - Steven H. Weintraub

Link: http://ul.to/jn1qutq2