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...laced by modern formal logic, which has its roots in the work of late 19th-century mathematicians such as [[Gottlob Frege]]. Today, the most commonly used sys ...roduction: Philosophy of logic today, pp. 1–12}} Starting in the late 19th century, many new formal systems have been proposed. There are disagreements about ...

==Recorded history before 12th century== ...Oxford|access-date=14 October 2014|url=http://www.visitoruk.com/Oxford/8th-century-T4311.html}}</ref> ...

...[[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 ...