How to prove it : a structured approach
Velleman, Daniel J.
How to prove it : a structured approach - New York Cambridge University Press 1994 - 309
0-521-44116-1
Logic, Symbolic and mathematical
C QA 9 V38 1994
How to prove it : a structured approach - New York Cambridge University Press 1994 - 309
0-521-44116-1
Logic, Symbolic and mathematical
C QA 9 V38 1994