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{{Short description|Danish mathematician (1766–1825)}} ...uction of more modern and advanced [[mathematics]] in the [[Denmark-Norway|Danish-Norwegian]] school system. ...

...ysics)|period]] of [[Cepheid]] [[variable stars]] at the beginning of 20th century. ...chemistry: their changing roles from alchemical times to the mid-twentieth century|last=F.|first=Rayner-Canham, Marelene|date=1998|publisher=American Chemical ...

...[[history of Islam]], traditionally dated from the 8th century to the 13th century.<ref name=Saliba>{{cite book|last=Saliba |first=George |author-link=George ...phor of a [[Golden age (metaphor)|golden age]] began to be applied in 19th-century literature about [[Islamic history]], in the context of the western aesthet ...

...ge amount of energy, even by the energetic standards of radioactive decay. Scientists already knew about [[alpha decay]] and [[beta decay]], but fission assumed In the last years of the 19th century, scientists frequently experimented with the [[cathode-ray tube]], which by then had be ...

...on has noted that Einstein's reminiscences were probably colored by a half-century of hindsight. Norton lists several problems with Einstein's recounting, bot :2. A 19th century [[Aether theories|aether theorist]] would have had no difficulties with the ...

...ved to Boreham Road, Warminster, where houses were built in the early 19th century.{{R|"Warminster and Westbury Journal 11 July 1903"|"Wiltshire Times 9 Augus ...rst1=Sally |date=February 2019 |title=In Defence of Britain: Women in 20th-century Military Engineering |magazine=Viewpoint |publisher=[[British Society for t ...