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The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal, [1] [2] and the name Impossible Puzzle was coined by Martin Gardner. [3] The puzzle is solvable, though not easily. There exist many similar puzzles.
Here all pieces have the same width and can be put in a perfect line segment. At present this puzzle is for instance sold by HIQU and comes with 100 figures to make and by Eureka Toys and Games in a puzzle called brain twister. [28] [29] Gardner's T: This is the version featured in Martin Gardner's Scientific American column. [6]
Reprinted in 2014 as Knots and Borromean Rings, Rep-Tiles, and Eight Queens: Martin Gardner's Unexpected Hanging, (Series: The New Martin Gardner Mathematical Library #4); The Mathematical Association of America/Cambridge University Press. Martin Gardner's Sixth Book of Mathematical Games from Scientific American (1971), W.H. Freeman and Company
A lifetime of puzzles : a collection of puzzles in honor of Martin Gardner's 90th birthday A K Peters: Wellesley, MA, ISBN 1568812450 Dirda, Michael (2009). Book review by Michael Dirda: 'When You Were a Tadpole and I Was a Fish' by Martin Gardner The Washington Post , October 22, 2009
The store experience includes walking narrow hallways with stairways to multiple levels and the occasional dead end. [6] A map describing the contents of each of the 32 rooms is available for visitors. [6] The Book Loft covers 7,500 square feet of space, and along with books the store sells jigsaw puzzles, posters, and other merchandise. [7]
In 1981, Gardner's column alternated with a new column by Douglas Hofstadter called "Metamagical Themas" (an anagram of "Mathematical Games"). [1] The table below lists Gardner's columns. [2] Twelve of Gardner's columns provided the cover art for that month's magazine, indicated by "[cover]" in the table with a hyperlink to the cover. [3]
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