TY  - BOOK
AU  - Velleman, Daniel J.,
TI  - How to prove it: a structured approach
SN  - 9780521861243
U1  - 511.3 VEL 
PY  - 2006///
CY  - Cambridge
PB  - Cambridge University Press
KW  - General principles of mathematics
KW  - Mathematics
KW  - Logic, symbolic and mathematical
ER  -