Authoritative – based on advice from ESL/EFL consultants around the world Authentic – examples and definitions taken from 100 million words of American English in the Cambridge International Co
A three-volume essay writing course for students in American English. Academic Writing Skills 2 takes students through a step-by-step process of writing expository, argumentative, and compare and cont
Among the many beautiful and nontrivial theorems in geometry found here are the theorems of Ceva, Menelaus, Pappus, Desargues, Pascal, and Brianchon. A nice proof is given of Morley's remarkable theor