The Tower of Hanoi (also called the Tower of Brahma or Lucas' Tower, and sometimes pluralised) is a mathematical game or puzzle. It consists of three rods, and a number of disks of different sizes which can slide onto any rod. The puzzle starts with the disks in a neat stack in ascending order of size on one rod, the smallest at the top, thus making a conical shape.
The objective of the puzzle is to move the entire stack to another rod, obeying the following rules:
- Only one disk may be moved at a time.
- Each move consists of taking the upper disk from one of the rods and sliding it onto another rod, on top of the other disks that may already be present on that rod.
- No disk may be placed on top of a smaller disk.
With three disks, the puzzle can be solved in seven moves.
Read more about Tower Of Hanoi: Origins, Solution, Graphical Representation, Applications, General Shortest Paths and The Number 466/885, In Popular Culture
Famous quotes containing the words tower of and/or tower:
“So was produced this tragedy
In a far tower of ivory
Where, O young men, late in the night
All you who drink light and stroke the air
Come back, seeking the night, and cry
To strict Rapunzel to let down her hair.”
—Allen Tate (1899–1979)
“If God made me a princess, why didn’t he take a little more time and make my hair so it wouldn’t snarl?”
—Robert N. Lee. Rowland V. Lee. Princess, Tower of London, while the Princess’ mother is combing her hair (1939)