For olympiad students: I have now published some new algebra handouts. They are:

**Introduction to Functional Equations**, which cover the basic techniques and theory for FE’s typically appearing on olympiads like USA(J)MO.
**Monsters**, an advanced handout which covers functional equations that have pathological solutions. It covers in detail the solutions to Cauchy functional equation.
**Summation,** which is a compilation of various types of olympiad-style sums like generating functions and multiplicative number theory.

I have also uploaded:

**English**, notes on proof-writing that I used at the 2016 MOP (Mathematical Olympiad Summer Program).

You can download all these (and other handouts) from my MIT website. Enjoy!

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