Basic mathematical concepts / F. Lynwood Wren. Wren, Frank Lynwood, 1894- Arithmetic Foundations. Geometry Foundations. QA248.3 .W7 1973 513.133 WRB Includes index. Bibliography: p. 451-452. New York : McGraw-Hill, 1973. 1973. 1973 Text xvi, 503 p. : eng