This work is intended for individual study and as a text for graduate level courses such as the one from which this material stems, given by Professor W. Ambros... » 

This work is intended for individual study and as a text for graduate level courses such as the one from which this material stems, given by Professor W. Ambrose at MIT in 1958-1959. The authors believe that this subject matter lends itself to a synthesis of several branches of mathematics. «