"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.
A Sudoku grid can be solved using only row and column logic, never needing box constraints — but it becomes exponentially harder.