# tam giác bất khả thi

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The Penrose triangle, also known as the Penrose tribar, the impossible tribar,[1] or the impossible triangle,[2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing, but cannot exist as a solid object. It was first created by the Swedish artist Oscar Reutersvärd in 1934.[3] Independently from Reutersvärd, the triangle was devised and popularized in the 1950s by psychiatrist Lionel Penrose and his son, prominent Nobel Prize-winning mathematician Sir Roger Penrose, who described it as "impossibility in its purest form".[4] It is featured prominently in the works of artist M. C. Escher, whose earlier depictions of impossible objects partly inspired it.

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## Description

The tribar/triangle appears to lớn be a solid object, made of three straight beams of square cross-section which meet pairwise at right angles at the vertices of the triangle they sườn. The beams may be broken, forming cubes or cuboids.

This combination of properties cannot be realized by any three-dimensional object in ordinary Euclidean space. Such an object can exist in certain Euclidean 3-manifolds.[5] There also exist three-dimensional solid shapes each of which, when viewed from a certain angle, appears the same as the 2-dimensional depiction of the Penrose triangle on this page (such as – for example – the adjacent image depicting a sculpture in Perth, Australia). The term "Penrose Triangle" can refer to lớn the 2-dimensional depiction or the impossible object itself.

If a line is traced around the Penrose triangle, a 4-loop Möbius strip is formed.[6]

## Depictions

M.C. Escher's lithograph Waterfall (1961) depicts a watercourse that flows in a zigzag along the long sides of two elongated Penrose triangles, so sánh that it ends up two stories higher than vãn it began. The resulting waterfall, forming the short sides of both triangles, drives a water wheel. Escher points out that in order to lớn keep the wheel turning, some water must occasionally be added to lớn compensate for evaporation.

### Sculptures

• Impossible triangle sculpture as an optical illusion, East Perth, Western Australia

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Impossible Triangle sculpture, Gotschuchen, Austria

• Real Penrose Triangle, Stainless Steel, by W.A.Stanggaßinger, Wasserburg am Inn, Germany. This type of impossible triangle was first created in 1969 by the Soviet kinetic artist Vyacheslav Koleichuk.[7]

• Impossible trident
• Shepard elephant
• Three hares
• Penrose steps
• Mobius strip

## References

1. ^ Pappas, Theoni (1989). "The Impossible Tribar". The Joy of Mathematics: Discovering Mathematics All Around You. San Carlos, California: Wide World Publ./Tetra. p. 13.
2. ^ Brouwer, James R.; Rubin, David C. (June 1979). "A simple design for an impossible triangle". Perception. 8 (3): 349–350. doi:10.1068/p080349. PMID 534162. S2CID 41895719.
3. ^ Ernst, Bruno (1986). "Escher's impossible figure prints in a new context". In Coxeter, H. S. M.; Emmer, M.; Penrose, R.; Teuber, M. L. (eds.). M. C. Escher Art and Science: Proceedings of the International Congress on M. C. Escher, Rome, Italy, 26–28 March, 1985. North-Holland. pp. 125–134. See in particular p. 131.
4. ^ Penrose, L. S.; Penrose, R. (February 1958). "Impossible objects: a special type of visual illusion". British Journal of Psychology. 49 (1): 31–33. doi:10.1111/j.2044-8295.1958.tb00634.x. PMID 13536303.
5. ^ Francis, George K. (1988). "Chapter 4: The impossible tribar". A Topological Picturebook. Springer. pp. 65–76. doi:10.1007/978-0-387-68120-7_4. ISBN 0-387-96426-6. See in particular p. 68, where Francis attributes this observation to lớn John Stillwell.
6. ^ Gardner, Martin (August 1978). "Mathematical Games: A Möbius band has a finite thickness, and so sánh it is actually a twisted prism". Scientific American. 239 (2): 18–26. doi:10.1038/scientificamerican1278-18. JSTOR 24960346.
7. ^ Федоров, Ю. (1972). "Невозможное-Возможно". Техника Молодежи. 4: 20–21.