Can a 4x11 rectangular grid of square blocks be covered (having no overlaps), with multiple copies of the tetromino (including rotations, but not reflections) as shown below?
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If so, give an example. If not, provide a proof that this cannot be achieved.
Note: Each of the 44 square blocks of the 4x11 grid has the same shape and size as each of the 4 square blocks of the tetromino.
(In reply to
Divisibility by Brian Smith)
George Edward Martin, in "Polyominoes: a guide to puzzles and problems in tiling", provides a proof showing that Ltetrominoes of 4 unit squares covering an h x w unitsquare rectangle can only occur if hw is divisible by 8, and that the h x w unitsquare rectangle must be either (1) an 8m x n unitsquare rectangle with n odd or (2) a 2m x 4n unitsquare rectangle. As 4 x 11 is neither in the form of 8m x n nor 2m x 4n unitsquares, the Ltetromino of 4 unit squares can not cover a 4 x 11 unitsquare rectangle.

Posted by Dej Mar
on 20100323 01:41:02 