MathSchoolinternational.com contain houndreds of Free Math e-Books. Which cover almost all topics of mathematics. To see an extisive list of
Higher Alebra eBooks . We hope mathematician or person who’s interested in mathematics like these books.

O Lovel Mathematics challenging drill questions written by Thomas Bond Department of Mathematics, Raymond and Beverly Sackler, Faculty of Exact Sciences, Tel Aviv University, Ramat-Aviv, Tel Aviv 69978, ISRAEL
This is an other great mathematics book cover the following topics.

Introduction.

Explicit constructions:

Group theory and graphs with large girth.

Expanders and superconcentrators.

Character sums and pseudo-random graphs.

More mathematical tools:

Real varieties and sign patterns of polynomials.

The Chevalley-Warning theorem, Abelian groups and regular graphs.

More polynomials.

Hyperbolic geometry and triangulations of polytopes and polygons.

The Erd¨os-Mozer Conjecture and the hard Lefschetz Theorem.