7
1
5
4
2
7
9
1
5
7
1
4
9
6
7
9
5
6
4
2
9
6
7
2
1
9
3
8
7
7
5
6
4
9
3
"In mathematics you don't understand things. You just get used to them." — John von Neumann
"In mathematics you don't understand things. You just get used to them." — John von Neumann
"What is a proof? It is a demonstration that a statement is necessarily true — a guarantee that no exception can exist." — Henri Poincaré
"What is a proof? It is a demonstration that a statement is necessarily true — a guarantee that no exception can exist." — Henri Poincaré