Random and Pseudorandom
In Our Time13 Jan 2011

Random and Pseudorandom

Melvyn Bragg and his guests discuss randomness and pseudorandomness.Randomness is the mathematics of the unpredictable. Dice and roulette wheels produce random numbers: those which are unpredictable and display no pattern. But mathematicians also talk of 'pseudorandom' numbers - those which appear to be random but are not. In the last century random numbers have become enormously useful to statisticians, computer scientists and cryptographers. But true randomness is difficult to find, and mathematicians have devised many ingenious solutions to harness or simulate it. These range from the Premium Bonds computer ERNIE (whose name stands for Electronic Random Number Indicator Equipment) to new methods involving quantum physics.Digital computers are incapable of behaving in a truly random fashion - so instead mathematicians have taught them how to harness pseudorandomness. This technique is used daily by weather forecasters, statisticians, and computer chip designers - and it's thanks to pseudorandomness that secure credit card transactions are possible.With:Marcus du SautoyProfessor of Mathematics at the University of OxfordColva Roney-DougalSenior Lecturer in Pure Mathematics at the University of St AndrewsTimothy GowersRoyal Society Research Professor in Mathematics at the University of CambridgeProducer: Thomas Morris.

Episoder(1078)

The Rapture

The Rapture

Melvyn Bragg and guests discuss the ideas developed by the Anglican priest John Nelson Darby (1800-1882), drawn from his reading of scripture, in which Jesus would suddenly take His believers up into the air, and those left behind would suffer on Earth until He returned with His church to rule for a thousand years before Final Judgement. Some believers would look for signs that civilization was declining, such as wars and natural disasters, or for new Roman Empires that would harbour the Antichrist, and from these predict the time of the Rapture. Darby helped establish the Plymouth Brethren, and later his ideas were picked up in the Scofield Reference Bible (1909) and soon became influential, particularly in the USA. With Elizabeth Phillips Research Fellow at the Margaret Beaufort Institute at the University of Cambridge and Honorary Fellow in the Department of Theology and Religion at Durham UniversityCrawford Gribben Professor of Early Modern British History at Queen’s University Belfastand Nicholas Guyatt Reader in North American History at the University of CambridgeProducer: Simon Tillotson

26 Sep 201951min

Napoleon's Retreat from Moscow

Napoleon's Retreat from Moscow

Melvyn Bragg and guests discuss how, in September 1812, Napoleon captured Moscow and waited a month for the Russians to meet him, to surrender and why, to his dismay, no-one came. Soon his triumph was revealed as a great defeat; winter was coming, supplies were low; he ordered his Grande Armée of six hundred thousand to retreat and, by the time he crossed back over the border, desertion, disease, capture, Cossacks and cold had reduced that to twenty thousand. Napoleon had shown his weakness; his Prussian allies changed sides and, within eighteen months they, the Russians and Austrians had captured Paris and the Emperor was exiled to Elba.WithJanet Hartley Professor Emeritus of International History, LSEMichael Rowe Reader in European History, King’s College LondonAndMichael Rapport Reader in Modern European History, University of GlasgowProducer: Simon Tillotson

19 Sep 201954min

Lorca

Lorca

Melvyn Bragg and guests discuss the Spanish poet and playwright Federico Garcia Lorca (1898-1936), author of Blood Wedding, Yerma and The House of Bernarda Alba, who mixed the traditions of Andalusia with the avant-garde. He found his first major success with his Gypsy Ballads, although Dali, once his close friend, mocked him for these, accusing Lorca of being too conservative. He preferred performing his poems to publishing them, and his plays marked a revival in Spanish theatre. He was captured and killed by Nationalist forces at the start of the Civil War, his body never recovered, and it's been suggested this was punishment for his politics and for being openly gay. He has since been seen as the most important Spanish playwright and poet of the last century.WithMaria Delgado Professor of Creative Arts at the Royal Central School of Speech and Drama, University of LondonFederico Bonaddio Reader in Modern Spanish at King’s College LondonAndSarah Wright Professor of Hispanic Studies and Screen Arts at Royal Holloway, University of LondonProducer: Simon Tillotson

4 Jul 201953min

Doggerland

Doggerland

Melvyn Bragg and guests discuss the people, plants and animals once living on land now under the North Sea, now called Doggerland after Dogger Bank, inhabited up to c7000BC or roughly 3000 years before the beginnings of Stonehenge. There are traces of this landscape at low tide, such as the tree stumps at Redcar (above); yet more is being learned from diving and seismic surveys which are building a picture of an ideal environment for humans to hunt and gather, with rivers and wooded hills. Rising seas submerged this land as glaciers melted, and the people and animals who lived there moved to higher ground, with the coasts of modern-day Britain on one side and Denmark, Germany, The Netherlands, Belgium and France on the other.With Vince Gaffney Anniversary Professor of Landscape Archaeology at the University of BradfordCarol Cotterill Marine Geoscientist at the British Geological SurveyAndRachel Bynoe Lecturer in Archaeology at the University of SouthamptonProducer: Simon Tillotson

27 Jun 201954min

The Mytilenaean Debate

The Mytilenaean Debate

Melvyn Bragg and guests discuss why Athenians decided to send a fast ship to Lesbos in 427BC, rowing through the night to catch one they sent the day before. That earlier ship had instructions to kill all adult men in Mytilene, after their unsuccessul revolt against Athens, as a warning to others. The later ship had orders to save them, as news of their killing would make others fight to the death rather than surrender. Thucydides retells this in his History of the Peloponnesian War as an example of Athenian democracy in action, emphasising the right of Athenians to change their minds in their own interests, even when a demagogue argued they were bound by their first decision. WithAngela Hobbs Professor of the Public Understanding of Philosophy at the University of SheffieldLisa Irene Hau Senior Lecturer in Classics at the University of GlasgowAndPaul Cartledge Emeritus AG Leventis Professor of Greek Culture, University of Cambridge and Senior Research Fellow of Clare CollegeProducer: Simon Tillotson

20 Jun 201954min

The Inca

The Inca

Melvyn Bragg and guests discuss how the people of Cusco, in modern Peru, established an empire along the Andes down to the Pacific under their supreme leader Pachacuti. Before him, their control grew slowly from C13th and was at its peak after him when Pizarro arrived with his Conquistadors and captured their empire for Spain in 1533. The image, above, is of Machu Picchu which was built for emperor Pachacuti as an estate in C15th. With Frank Meddens Visiting Scholar at the University of ReadingHelen Cowie Senior Lecturer in History at the University of YorkAndBill Sillar Senior Lecturer at the Institute of Archaeology at University College LondonProducer: Simon Tillotson

13 Jun 201952min

Sir Thomas Browne

Sir Thomas Browne

Melvyn Bragg and guests discuss the range, depth and style of Browne (1605-82) , a medical doctor whose curious mind drew him to explore and confess his own religious views, challenge myths and errors in science and consider how humans respond to the transience of life. His Religio Medici became famous throughout Europe and his openness about his religion, in that work, was noted as rare when others either kept quiet or professed orthodox views. His Pseudodoxia Epidemica challenged popular ideas, whether about the existence of mermaids or if Adam had a navel, and his Hydriotaphia or Urn Burial was a meditation on what matters to humans when handling the dead. In 1923, Virginia Woolf wrote, "Few people love the writings of Sir Thomas Browne, but those that do are the salt of the earth." He also contributed more words to the English language than almost anyone, such as electricity, indigenous, medical, ferocious, carnivorous ambidextrous and migrant.With Claire Preston Professor of Renaissance Literature at Queen Mary University of LondonJessica Wolfe Professor of English and Comparative Literature at the University of North Carolina at Chapel HillAndKevin Killeen Professor of English at the University of YorkProducer: Simon Tillotson

6 Jun 201952min

President Ulysses S Grant

President Ulysses S Grant

Melvyn Bragg and guests discuss the impact of Grant's presidency on Americans in the years after the Civil War in which he, with Lincoln, had led the Union Army to victory. His predecessor, Andrew Johnson, was prepared to let the Southern States decide for themselves which rights to allow freed slaves; Grant supported equal rights, and he used troops and Enforcement Acts to defeat the Ku klux Klan which was violently suppressing African Americans. In later years Grant was remembered mainly for the corruption scandals under his terms of office, and for his failure to support or protect Native Americans, but in more recent decades his support for reconstruction has prompted a reassessement.WithErik Mathisen Lecturer in US History at the University of KentSusan-Mary Grant Professor of American History at Newcastle UniversityandRobert Cook Professor of American History at the University of SussexProducer: Simon Tillotson

30 Mai 201955min

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