PlaySudoku.us
Easy · Puzzle #785
5
3
4
8
6
1
6
3
7
9
2
1
7
9
4
8
1
4
2
6
9
8
9
3
5
4
6
5
7
8
4
1
9
1
3
6
2
9
4
6
5
8
7
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.
"As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." — Albert Einstein
"As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." — Albert Einstein