Non-Euclidean Geometry
H. S. M. Coxeter
Harold Scott MacDonald "Donald" Coxeter, CC, FRS, FRSC was a British and later also Canadian geometer. He is regarded as one of the greatest geometers of the 20th century. *--Wikipedia*
H. S. M. Coxeter

H. S. M. Coxeter
H. S. M. Coxeter

H. S. M. Coxeter

H. S. M. Coxeter
H. S. M. Coxeter

H. S. M. Coxeter

H. S. M. Coxeter