G. S. Carr
George Shoobridge Carr was a British mathematician. He wrote Synopsis of Pure Mathematics. This book, first published in England in 1880, was read and studied closely by mathematician Srinivasa Ramanujan when he was a teenager. Ramanujan had already produced many theorem by the age of 15.
Carr was a private coach for the Tripos mathematics examinations at the University of Cambridge, and the Synopsis was written as a study guide for those examinations.