books by subject
Calculus & Mathematical Analysis

Partial Differential Equations for Scientists and Engineers (Dover Books on Mathematics)

Complex Functions: An Algebraic and Geometric Viewpoint

Tensor Analysis on Manifolds (Dover Books on Mathematics)

A Brief on Tensor Analysis (Undergraduate Texts in Mathematics)

Schaum's Outline of Partial Differential Equations (Schaum's Outlines)

Classical Potential Theory and Its Probabilistic Counterpart (Classics in Mathematics)

Calculus (London School of Economics Mathematics)

Nonlinear Ordinary Differential Equations

Complex Variables for Scientists and Engineers

Schaum's Outline of Theory and Problems of Differential Equations (Schaum's Outline S.)

Vector Analysis

Using Computational Fluid Dynamics

Vectors in Two and Three Dimensions (GCE A Level Pure Mathematics)

Spectra and Pseudospectra: The Behavior of Nonnormal Matrices and Operators

Help Yourself to Advanced Algebra Paper

Calculus

Knots and Surfaces (Oxford Science Publications)

Algebraic Combinatorics and Computer Science: A Tribute to Gian-Carlo Rota

The World According to Wavelets: The Story of a Mathematical Technique in the Making

Calculus with Analytic Geometry

The Remarkable Lives of Numbers: A Mathematical Compendium from 1 to 200

Unit 26 (Numerical Methods for Differential Equations)

The Calculus Story: A Mathematical Adventure

Ordinary Differential Equations

Integral Equations P: 13 (Wiley Classics Library)

Principles of Functional Analysis

Mechanics 1 (Modular Maths for Edexcel) (Modular Maths for Edexcel: Mechanics - Statistics)

Advanced calculus for applications (Prentice-Hall mathematics series)

Optimization and Approximation
