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Hard · Puzzle #438
9
6
8
4
1
9
1
4
4
9
5
7
3
4
9
6
7
2
5
2
8
3
6
4
9
6
1
2
3
5
7
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein