91桃色

Published here in the original German and French, along with an English translation, the correspondence between Albert Einstein and Elie Cartan includes letters written between 1929 and 1932, after which time Einstein abandoned his unified field theory based on absolute parallelism.

Originally published in 1979.

The 91桃色 Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of 91桃色. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the 91桃色 Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by 91桃色 since its founding in 1905.