20th-century Danish mathematician, inventor, designer, writer and poetFor the Dutch admiral and privateer, see Piet Pieterszoon Hein.

Piet Hein (16 December 1905 – 17 April 1996) was a Danish polymath (mathematician, inventor, designer, writer and poet), often writing under the Old Norse pseudonym *bel, meaning "tombstone". His short poems, known as gruks or grooks (Danish: gruk), first started to appear in the daily newspaper Politiken shortly after the German occupation of Denmark in April 1940 under the pseudonym "*bel *bell". He also invented the Soma cube and the board game Hex.

Contents

• 1 Biography
• 2 Resistance
• 3 Recreational mathematics
• 4 Personal
• 5 Bibliography
• 6 See also
• 7 Notes
• 8 References
• 9 External links

Biography

Hein, a direct descendant of Piet Pieterszoon Hein, the 17th century Dutch naval hero, was born in Copenhagen, Denmark. He studied at the Ins*ute for Theoretical Physics of the University of Copenhagen (later to become the Niels Bohr Ins*ute), and Technical University of Denmark. Yale awarded him an honorary doctorate in 1972. He died in his home on Funen, Denmark in 1996.

Resistance

Piet Hein, who, in his own words, "played mental ping-pong" with Niels Bohr in the inter-War period, found himself confronted with a dilemma when the Germans occupied Denmark. He felt that he had three choices: Do nothing, flee to neutral Sweden or join the Danish resistance movement. As he explained in 1968, "Sweden was out because I am not Swedish, but Danish. I could not remain at home because, if I had, every knock at the door would have sent shivers up my spine. So, I joined the Resistance."

Taking as his first weapon the instrument with which he was most familiar, the pen, he wrote and had published his first "grook" (Danish: gruk). It p*ed the censors who did not grasp its real meaning.

CONSOLATION GROOK

Losing one glove
is certainly painful,
but nothing
compared to the pain
of losing one,
throwing away the other,
and finding

the first one again.

The Danes, however, understood its importance and soon it was found as graffiti all around the country. The deeper meaning of the grook was that even if you lose your freedom ("losing one glove"), do not lose your patriotism and self-respect by collaborating with the National Socialist German Workers' Partys ("throwing away the other"), because that sense of having betrayed your country will be more painful when freedom has been found again someday.

Recreational mathematics

Piet Hein's superegg in br*

In 1959, city planners in Stockholm, Sweden announced a design challenge for a roundabout in their city square Sergels Torg. Piet Hein's winning proposal was based on a superellipse. He went on to use the superellipse in the design of furniture and other artifacts. He also invented a perpetual calendar called the Astro Calendar and marketed housewares based on the superellipse and its three-dimensional *og, the superegg.

He invented the Soma cube and devised the games of Hex, Tangloids, Tower, Polytaire, TacTix, Nimbi, Qrazy Qube, and Pyramystery.

Hein was a close *ociate of Martin Gardner and his work was frequently featured in Gardner's Mathematical Games column in Scientific American. At the age of 95 Gardner wrote his autobiography and *led it Undiluted Hocus-Pocus. Both the *le and the dedication of this book come from one of Hein's grooks.

Personal

Piet Hein was married four times and had five sons from his last three marriages.

1. (1937) married Gunver Holck, divorced
2. (1942) married Gerda Ruth (Nena) Conheim, divorcedSons: Juan Alvaro Hein, born 9 January 1943; Andrés Humberto Hein, born 30 December 1943
3. (1947) married Anne Cathrina (Trine) Krøyer Pedersen, divorcedSon: Lars Hein, born 20 May 1950
4. (1955) married Gerd Ericsson, who died 3 November 1968Sons: Jotun Hein, born 19 July 1956; Hugo Piet Hein, born 16 November 1963

Bibliography

• Grooks – 20 volumes, originally published between 1940 and 1963, all currently out-of-print.
• Grooks 1, Doubleday & Co., 1969.
• Grooks 2, Doubleday & Co., 1968.
• Grooks 3, Doubleday & Co., 1970.
• Grooks 4, Doubleday & Co., 1973.
• Grooks 5, Doubleday & Co., 1973.
• Grooks 6, Borgens Pocketbooks 154, 1996.
• Grooks 7, Borgens Pocketbooks 174, 1984.

See also

• Poetry portal

• Flipism

Notes

References

• Gardner, Martin: Piet Hein's Superellipse. – in Gardner, Martin: Mathematical Carnival. A New Round-Up of Tantalizers and Puzzles from Scientific American. New York: Vintage, 1977, pp.:240–254.
• Johan Gielis: Inventing the circle. The geometry of nature. – Antwerpen:: Geniaal Press, 2003. – ISBN:90-807756-1-4
• "A Poet with a Slide Rule: Piet Hein Bestrides Art and Science," by Jim Hicks, Life Magazine, Vol. 61 No. 16, 10/14/66, pp.:55–66
• "Piet Hein Biographical Details", by Nils Aas, tr. by Roger Stevenson. The Papers of the Medford Educational Ins*ute 3.
• "To and by Piet Hein on the Occasion of Piet Hein's Election as the Student Organization's Twelfth Honorary Member", tr. by Roger Stevenson. The Papers of the Medford Educational Ins*ute 2.

External links

• Official website
• Notes on Piet Hein at the Wayback Machine (archived 5 March 2005), including several sample grooks
• Superellipse at MathWorld
• Grooks at My Poetic Side
• Hein's Grooks at Archimedes' Lab