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Hard · Puzzle #420
3
4
6
5
6
7
1
7
1
2
6
5
9
8
9
7
6
8
2
2
9
9
4
1
3
1
8
"Many who have had an opportunity of knowing any more about mathematics confuse it with arithmetic, and consider it an arid science. In reality, however, it is a science which requires a great deal of imagination." — Sofia Kovalevskaya
"Many who have had an opportunity of knowing any more about mathematics confuse it with arithmetic, and consider it an arid science. In reality, however, it is a science which requires a great deal of imagination." — Sofia Kovalevskaya
"What we know is a drop; what we don't know is an ocean." — Isaac Newton
"What we know is a drop; what we don't know is an ocean." — Isaac Newton