P v NP
In Our Time5 Nov 2015

P v NP

Melvyn Bragg and guests discuss the problem of P versus NP, which has a bearing on online security. There is a $1,000,000 prize on offer from the Clay Mathematical Institute for the first person to come up with a complete solution. At its heart is the question "are there problems for which the answers can be checked by computers, but not found in a reasonable time?" If the answer to that is yes, then P does not equal NP. However, if all answers can be found easily as well as checked, if only we knew how, then P equals NP. The area has intrigued mathematicians and computer scientists since Alan Turing, in 1936, found that it's impossible to decide in general whether an algorithm will run forever on some problems. Resting on P versus NP is the security of all online transactions which are currently encrypted: if it transpires that P=NP, if answers could be found as easily as checked, computers could crack passwords in moments.

With

Colva Roney-Dougal Reader in Pure Mathematics at the University of St Andrews

Timothy Gowers Royal Society Research Professor in Mathematics at the University of Cambridge

And

Leslie Ann Goldberg Professor of Computer Science and Fellow of St Edmund Hall, University of Oxford

Producer: Simon Tillotson.

Avsnitt(1078)

Charisma

Charisma

Melvyn Bragg and guests discuss the idea of charismatic authority developed by Max Weber (1864-1920) to explain why people welcome some as their legitimate rulers and follow them loyally, for better or worse, while following others only dutifully or grudgingly. Weber was fascinated by those such as Napoleon (above) and Washington who achieved power not by right, as with traditional monarchs, or by law as with the bureaucratic world around him in Germany, but by revolution or insurrection. Drawing on the experience of religious figures, he contended that these leaders, often outsiders, needed to be seen as exceptional, heroic and even miraculous to command loyalty, and could stay in power for as long as the people were enthralled and the miracles they had promised kept coming. After the Second World War, Weber's idea attracted new attention as a way of understanding why some reviled leaders once had mass support and, with the arrival of television, why some politicians were more engaging and influential on screen than others. With Linda Woodhead The FD Maurice Professor and Head of the Department of Theology and Religious Studies at King's College LondonDavid Bell The Lapidus Professor in the Department of History at Princeton UniversityAndTom Wright Reader in Rhetoric at the University of SussexProducer: Simon Tillotson

14 Apr 202252min

Seismology

Seismology

Melvyn Bragg and guests discuss the study of earthquakes. A massive earthquake in 1755 devastated Lisbon, and this disaster helped inspire a new science of seismology which intensified after San Francisco in 1906 and advanced even further with the need to monitor nuclear tests around the world from 1945 onwards. While we now know so much more about what lies beneath the surface of the Earth, and how rocks move and crack, it remains impossible to predict when earthquakes will happen. Thanks to seismology, though, we have a clearer idea of where earthquakes will happen and how to make some of them less hazardous to lives and homes.WithRebecca Bell Senior lecturer in Geology and Geophysics at Imperial College LondonZoe Mildon Lecturer in Earth Sciences and Future Leaders Fellow at the University of PlymouthAnd James Hammond Reader in Geophysics at Birkbeck, University of LondonProducer: Simon Tillotson

7 Apr 202249min

The Arthashastra

The Arthashastra

Melvyn Bragg and guests discuss the ancient Sanskrit text the Arthashastra, regarded as one of the major works of Indian literature. Written in the style of a scientific treatise, it provides rulers with a guide on how to govern their territory and sets out what the structure, economic policy and foreign affairs of the ideal state should be. According to legend, it was written by Chanakya, a political advisor to the ruler Chandragupta Maurya (reigned 321 – 297 BC) who founded the Mauryan Empire, the first great Empire in the Indian subcontinent. As the Arthashastra asserts that a ruler should pursue his goals ruthlessly by whatever means is required, it has been compared with the 16th-century work The Prince by Machiavelli. Today, it is widely viewed as presenting a sophisticated and refined analysis of the nature, dynamics and challenges of rulership, and scholars value it partly because it undermines colonial stereotypes of what early South Asian society was like. WithJessica Frazier Lecturer in the Study of Religion at the University of Oxford and a Fellow of the Oxford Centre for Hindu StudiesJames Hegarty Professor of Sanskrit and Indian Religions at Cardiff University And Deven Patel Associate Professor of South Asia Studies at the University of PennsylvaniaProducer: Simon Tillotson

31 Mars 202256min

Peter Kropotkin

Peter Kropotkin

Melvyn Bragg and guests discuss the Russian prince who became a leading anarchist and famous scientist. Kropotkin (1842 - 1921) was born into privilege, very much in the highest circle of Russian society as a pageboy for the Tsar, before he became a republican in childhood and dropped the title 'Prince'. While working in Siberia, he started reading about anarchism and that radicalised him further, as did his observations of Siberian villagers supporting each other without (or despite) a role for the State. He made a name for himself as a geographer but soon his politics landed him in jail in St Petersburg, from which he escaped to exile in England where he was fêted, with growing fame leading to lecture tours in the USA. His time in Siberia also inspired his ideas on the importance of mutual aid in evolution, a counter to the dominant idea from Darwin and Huxley that life was a gladiatorial combat in which only the fittest survived. Kropotkin became such a towering figure in public life that, returning to Russia, he was able to challenge Lenin without reprisal, and Lenin in turn permitted his enormous public funeral there, attended by 20,000 mourners.With Ruth Kinna Professor of Political Theory at Loughborough UniversityLee Dugatkin Professor of Biology at the University of LouisvilleAndSimon Dixon The Sir Bernard Pares Professor of Russian History at University College London

24 Feb 202251min

Romeo and Juliet

Romeo and Juliet

Melvyn Bragg and guests discuss William Shakespeare's famous tragedy, written in the early 1590s after a series of histories and comedies. His audience already knew the story of the feuding Capulets and Montagues in Verona and the fate of the young lovers from their rival houses, but not how Shakespeare would tell it and, with his poetry and plotting, he created a work so powerful and timeless that his play has shaped the way we talk of love, especially young love, ever since.The image above is of Mrs Patrick Campbell ('Mrs Pat') as Juliet and Johnson Forbes-Robinson as Romeo in a scene from the 1895 production at the Lyceum Theatre, LondonWithHelen Hackett Professor of English Literature at University College LondonPaul Prescott Professor of English and Theatre at the University of California MercedAndEmma Smith Professor of Shakespeare Studies at Hertford College, University of OxfordProducer: Simon Tillotson

17 Feb 202250min

Walter Benjamin

Walter Benjamin

Melvyn Bragg and guests discuss one of the most celebrated thinkers of the twentieth century. Walter Benjamin (1892-1940) was a German Jewish philosopher, critic, historian, an investigator of culture, a maker of radio programmes and more. Notably, in his Arcades Project, he looked into the past of Paris to understand the modern age and, in The Work of Art in the Age of Mechanical Reproduction, examined how the new media of film and photography enabled art to be politicised, and politics to become a form of art. The rise of the Nazis in Germany forced him into exile, and he worked in Paris in dread of what was to come; when his escape from France in 1940 was blocked at the Spanish border, he took his own life. With Esther Leslie Professor of Political Aesthetics at Birkbeck, University of LondonKevin McLaughlin Dean of the Faculty and Professor of English, Comparative Literature and German Studies at Brown UniversityAndCarolin Duttlinger Professor of German Literature and Culture at the University of OxfordProducer: Simon Tillotson

10 Feb 202250min

The Temperance Movement

The Temperance Movement

Melvyn Bragg and guests discuss the momentum behind teetotalism in 19th Century Britain, when calls for moderation gave way to complete abstinence in pursuit of a better life. Although arguments for temperance had been made throughout the British Isles beforehand, the story of the organised movement in Britain is often said to have started in 1832 in Preston, when Joseph Livesey and seven others gave a pledge to abstain. The movement grew quickly, with Temperance Halls appearing as new social centres in towns in place of pubs, and political parties being drawn into taking sides either to support abstinence or impose it or reject it. The image above, which appeared in The Teetotal Progressionist in 1852, is an example of the way in which images contained many points of temperance teaching, and is © Copyright Livesey Collection at the University of Central Lancashire. WithAnnemarie McAllister Senior Research Fellow in History at the University of Central LancashireJames Kneale Associate Professor in Geography at University College LondonAndDavid Beckingham Associate Professor in Cultural and Historical Geography at the University of NottinghamProducer: Simon Tillotson

3 Feb 202252min

Colette

Colette

Melvyn Bragg and guests discuss one of the outstanding French writers of the twentieth century. The novels of Sidonie-Gabrielle Colette (1873 - 1954) always had women at their centre, from youth to mid-life to old age, and they were phenomenally popular, at first for their freshness and frankness about women’s lives, as in the Claudine stories, and soon for their sheer quality as she developed as a writer. Throughout her career she intrigued readers by inserting herself, or a character with her name, into her works, fictionalising her life as a way to share her insight into the human experience.With Diana Holmes Professor of French at the University of LeedsMichèle Roberts Writer, novelist, poet and Emeritus Professor of Creative Writing at the University of East AngliaAndBelinda Jack Fellow and Tutor in French Literature and Language at Christ Church, University of OxfordProducer: Simon Tillotson

27 Jan 202251min

Populärt inom Historia

massmordarpodden
motiv
olosta-mord
p3-historia
historianu-med-urban-lindstedt
rss-massmordarpodden
historiepodden-se
historiska-brott
rss-seriemordarpodden
bedragare
konspirationsteorier
rss-brottsligt
militarhistoriepodden
krigshistoriepodden
harrisons-dramatiska-historia
palmemordet
rss-borgvattnets-hemligheter
vetenskapsradion-historia
nu-blir-det-historia
rss-historien-om