TY - BOOK AU - Skemp Richard, R TI - Understanding mathematics: Answers to book 5 SN - 0340115424 U1 - 510 PY - 1967/// CY - London PB - University of London press KW - Mathematics N1 - Book 1 : 1970 Book 2 : 1965 ; Book 1 : 1970 Book 2 : 1965 ER -