Mathematical discovery.
POLYA, G.\
Mathematical discovery. - - John Wiley, New York, 1981 - xxv,220. - .
28
Mathematics-Problems, exercises, etc.
Problem solving
51 Pol
Mathematical discovery. - - John Wiley, New York, 1981 - xxv,220. - .
28
Mathematics-Problems, exercises, etc.
Problem solving
51 Pol