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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 ...