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(1084)

John Bull

John Bull

Melvyn Bragg and guests discuss the origin of this personification of the English everyman and his development as both British and Britain in the following centuries. He first appeared along with Lewi...

28 Jul 202253min

Angkor Wat

Angkor Wat

Melvyn Bragg and guests discuss the largest and arguably the most astonishing religious structure on Earth, built for Suryavarman II in the 12th Century in modern-day Cambodia. It is said to have more...

21 Jul 202249min

Dylan Thomas

Dylan Thomas

Melvyn Bragg and guests discuss the celebrated Welsh poet, Dylan Thomas (1914 - 1953). He wrote some of his best poems before he was twenty in the first half of his short, remarkable life, and was pro...

14 Jul 202250min

The Death of Stars

The Death of Stars

Melvyn Bragg and guests discuss the abrupt transformation of stars after shining brightly for millions or billions of years, once they lack the fuel to counter the force of gravity. Those like our own...

7 Jul 202258min

Hegel's Philosophy of History

Hegel's Philosophy of History

Melvyn Bragg and guests discuss ideas of Georg Wilhelm Friedrich Hegel (1770 - 1831) on history. Hegel, one of the most influential of the modern philosophers, described history as the progress in th...

23 Jun 202252min

Comenius

Comenius

Melvyn Bragg and guests discuss the Czech educator Jan Amos Komenský (1592-1670) known throughout Europe in his lifetime under the Latin version of his name, Comenius. A Protestant and member of the U...

16 Jun 202256min

Tang Era Poetry

Tang Era Poetry

Melvyn Bragg and guests discuss two of China’s greatest poets, Li Bai and Du Fu, who wrote in the 8th century in the Tang Era. Li Bai (701-762AD) is known for personal poems, many of them about drinki...

9 Jun 202246min

The Davidian Revolution

The Davidian Revolution

Melvyn Bragg and guests discuss the impact of David I of Scotland (c1084-1153) on his kingdom and on neighbouring lands. The youngest son of Malcolm III, he was raised in exile in the Anglo-Norman co...

2 Jun 202250min

Populært innen Historie

rss-dette-ma-aldri-skje-igjen
henrettelsespodden
rss-katastrofe
historier-som-endret-norge
rss-benadet
med-egne-oyne
aftenposten-historie
rss-nadelose-nordmenn-gestapo
rss-frontkjemperne
historier-som-endret-verden
sektledere
rss-historiske-romanser-svik-drap-og-kjarlighet
rss-strid-de-norske-borgerkrigene
rss-gamle-greier
rss-bisarr-historie
taakeprat
rss-historier-fra-gudbrandsdalen
historiepodden-ww2
historiepodden
liberal-halvtime