An introduction to the geometry of n dimensions. Sommerville, Duncan M'Laren Young, 1879-1934. Hyperspace. QA691 .S6 1958 513.82 SO9 "An unabridged and unaltered republication of the first edition." Includes bibliographies. New York, Dover Publications [1958] [1958] 1958 Text xvii, 196 p. : eng