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Theaetetus (mathematician)
Theaetetus of Athens (; ''Theaítētos''; c. 417 – c. 369 BCE), possibly the son of Euphronius of the Athenian deme Sunium, was a Greece, Greek mathematician. His principal contributions were on irrational number, irrational lengths, which was included in Book X of Euclid's Elements, Euclid's ''Elements'' and proving that there are precisely five Platonic solid, regular convex polyhedra. A friend of Socrates and Plato, he is the central character in Plato's Theaetetus (dialogue), eponymous Socratic dialogue. Theaetetus, like Plato, was a student of the Greek mathematician Theodorus of Cyrene. Cyrene was a prosperous Greek colony on the coast of North Africa, in what is now Libya, on the eastern end of the Gulf of Sidra. Theodorus had explored the theory of incommensurable quantities, and Theaetetus continued those studies with great enthusiasm; specifically, he classified various forms of irrational numbers according to the way they are expressed as square roots. This theory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holger Thesleff
Holger may refer to: People * Holger (given name), includes name origin, plus people with the name * Hilde Holger, stage name of dancer, choreographer and dance teacher Hilde Boman-Behram (née Hilde Sofer, 1905–2001) Fictional characters * Holger Danske, a legendary Danish hero Other uses * Holger Danske (Resistance group) * Holger Danske (opera) * 9266 Holger, a main-belt asteroid * Radio Holger {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ionia
Ionia ( ) was an ancient region encompassing the central part of the western coast of Anatolia. It consisted of the northernmost territories of the Ionian League of Greek settlements. Never a unified state, it was named after the Ionians who had settled in the region before the archaic period. Ionia proper comprised a narrow coastal strip from Phocaea in the north near the mouth of the river Hermus (now the Gediz), to Miletus in the south near the mouth of the river Maeander, and included the islands of Chios and Samos. It was bounded by Aeolia to the north, Lydia to the east and Caria to the south. The cities within the region figured significantly in the strife between the Persian Empire and the Greeks. Ionian cities were identified by mythic traditions of kinship and by their use of the Ionic dialect, but there was a core group of twelve Ionian cities that formed the Ionian League and had a shared sanctuary and festival at Panionion. These twelve cities were (from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
410s BC Births
41 may refer to: * 41 (number) * one of the years 41 BC, AD 41, 1941, 2041 Art and entertainment * ''41'' (film), a 2007 documentary about Nicholas O'Neill, the youngest victim of the Station nightclub fire * ''41'', an Australian award-winning science fiction time travel film about a time loop, by Glenn Triggs * ''41'', a 2012 documentary about President George H. W. Bush. * "#41" (song), a song by the Dave Matthews Band * ''Survivor 41'', the 41st installment of CBS's reality program ''Survivor'' * "Forty One", a song by Karma to Burn from the album ''Appalachian Incantation'', 2010 People * George H. W. Bush, or "Bush 41" (to distinguish him from his son, George W. Bush), 41st president of the United States * Nick "41" MacLaren, member of the New Zealand hip hop duo Frontline * 41 (group), a Brooklyn drill trio Others * HP-41C, a series of calculators made by Hewlett-Packard ** FOCAL (Hewlett-Packard) The HP-41C series are programmable, expandable, HP Continuous memory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4th-century BC Athenians
The 4th century was the time period from 301 CE (represented by the Roman numerals CCCI) to 400 CE (CD) in accordance with the Julian calendar. In the West, the early part of the century was shaped by Constantine the Great, who became the first Roman emperor to adopt Christianity. Gaining sole reign of the empire, he is also noted for re-establishing a single imperial capital, choosing the site of ancient Byzantium in 330 (over the current capitals, which had effectively been changed by Diocletian's reforms to Milan in the West, and Nicomedeia in the East) to build the city soon called Nova Roma (New Rome); it was later renamed Constantinople in his honor. The last emperor to control both the eastern and western halves of the empire was Theodosius I. As the century progressed after his death, it became increasingly apparent that the empire had changed in many ways since the time of Augustus. The two-emperor system originally established by Diocletian in the previous century fel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greek Geometers
Ancient history is a time period from the beginning of writing and recorded human history through late antiquity. The span of recorded history is roughly 5,000 years, beginning with the development of Sumerian cuneiform script. Ancient history covers all continents inhabited by humans in the period 3000 BCAD 500, ending with the expansion of Islam in late antiquity. The three-age system periodises ancient history into the Stone Age, the Bronze Age, and the Iron Age, with recorded history generally considered to begin with the Bronze Age. The start and end of the three ages vary between world regions. In many regions the Bronze Age is generally considered to begin a few centuries prior to 3000 BC, while the end of the Iron Age varies from the early first millennium BC in some regions to the late first millennium AD in others. During the time period of ancient history, the world population was exponentially increasing due to the Neolithic Revolution, which was in full prog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Speakers In Plato's Dialogues
following is a list of the speakers found in the dialogues traditionally ascribed to Plato, including extensively quoted, indirect and conjured speakers. Dialogues, as well as Platonic ''Epistles'' and ''Epigrams'', in which these individuals appear dramatically but do not speak are listed separately. List ;Unnamed speakers Notes Bibliography * Debra Nails. ''The People of Plato: A Prosopography of Plato and Other Socratics''. Hackett Publishing, 2002. . * Plato Plato ( ; Greek language, Greek: , ; born BC, died 348/347 BC) was an ancient Greek philosopher of the Classical Greece, Classical period who is considered a foundational thinker in Western philosophy and an innovator of the writte .... ''Complete Works''. Ed: John M. Cooper. Hackett Publishing, 1997. {{Socrates navbox * Platos Dialogues Speakers in Plato's dialogues ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar day) that is synchronized to its orbital period (Lunar month#Synodic month, lunar month) of 29.5 Earth days. This is the product of Earth's gravitation having tidal forces, tidally pulled on the Moon until one part of it stopped rotating away from the near side of the Moon, near side, making always the same lunar surface face Earth. Conversley, the gravitational pull of the Moon, on Earth, is the main driver of Earth's tides. In geophysical definition of planet, geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is , roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System, it is the List of Solar System objects by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theaetetus (crater)
Theaetetus is a lunar impact crater that is located to the southeast of the crater Cassini near the eastern edge of Mare Imbrium. It was named after the ancient Greek mathematician Theaetetus. It lies just to the west of the Montes Caucasus range, which forms the eastern shore of the mare. To the southwest is the prominent crater Aristillus. The rim of Theaetetus is distinctly polygonal in shape, with a slight rounding at the vertices. There is a low outer rampart and a slight central rise on the crater floor, which is offset to the northeast of the crater midpoint. The interior is otherwise relatively featureless. This crater has been noted in the past as a site of possible transient lunar phenomena. In 1902, a white cloud was observed briefly in the vicinity of the crater. Other observers, including Patrick Moore Sir Patrick Alfred Caldwell-Moore (; 4 March 1923 – 9 December 2012) was an English amateur astronomer who attained prominence in that field as a writer, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Debra Nails
Debra Nails (born November 15, 1950) is an American philosophy professor who taught at Michigan State University. Nails earned her M.A. in philosophy and classical Greek from Louisiana State University before going on to earn a Ph.D. in philosophy at the University of the Witwatersrand, Johannesburg in 1993.Michigan State University/philosophy/Debra Nails (accessed July 11, 2016) Previously, she taught in the Department of Classics, Philosophy, and Religion at Mary Washington College. Nails taught courses on the history of philosophy, continental rationalism, metaphysics, and modern philosophy. Contributions to philosophy Nails' work primarily focuses on ancient Greek philosophy, metaphysics, fem ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corinth
Corinth ( ; , ) is a municipality in Corinthia in Greece. The successor to the ancient Corinth, ancient city of Corinth, it is a former municipality in Corinthia, Peloponnese (region), Peloponnese, which is located in south-central Greece. Since the 2011 local government reform, it has been part of the Corinth (municipality), municipality of Corinth, of which it is the seat and a municipal unit. It is the capital of Corinthia. It was founded as Nea Korinthos (), or New Corinth, in 1858 after an earthquake destroyed the existing settlement of Corinth, which had developed in and around the site of the ancient city. History Corinth derives its name from Ancient Corinth, a city-state of antiquity. The site was occupied from before 3000 BC. Ancient Greece Historical references begin with the early 8th century BC, when ancient Corinth began to develop as a commercial center. Between the 8th and 7th centuries, the Bacchiad family ruled Corinth. Cypselus overthrew the Bacchiad f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dysentery
Dysentery ( , ), historically known as the bloody flux, is a type of gastroenteritis that results in bloody diarrhea. Other symptoms may include fever, abdominal pain, and a feeling of incomplete defecation. Complications may include dehydration. The cause of dysentery is usually the bacteria from genus '' Shigella'', in which case it is known as shigellosis, or the amoeba '' Entamoeba histolytica''; then it is called amoebiasis. Other causes may include certain chemicals, other bacteria, other protozoa, or parasitic worms. It may spread between people. Risk factors include contamination of food and water with feces due to poor sanitation. The underlying mechanism involves inflammation of the intestine, especially of the colon. Efforts to prevent dysentery include hand washing and food safety measures while traveling in countries of high risk. While the condition generally resolves on its own within a week, drinking sufficient fluids such as oral rehydration solutio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mediterranean
The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Europe, on the south by North Africa, and on the west almost by the Morocco–Spain border. The Mediterranean Sea covers an area of about , representing 0.7% of the global ocean surface, but its connection to the Atlantic via the Strait of Gibraltar—the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates the Iberian Peninsula in Europe from Morocco in Africa—is only wide. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely desiccated over a period of some 600,000 years during the Messinian salinity crisis before being refilled by the Zanclean flood about 5.3 million years ago. The sea was an important rout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
