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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 ...

...|s2cid=32486881}}</ref> However, the same standard could have no effect on male colleagues of the same age.<ref name=":7" /> ...ue-4-2012/age-management-as-a-tool-for-the-demographic-decline-in-the-21st-century-an-overview-of-its-characteristics|journal=Journal of Entrepreneurship, Man ...

...Charles Tilly]]). Almost all socialist countries that appeared in the 20th century arose out of wars. words ''pris'' or ''prix'' (French), ''Preis'' (German), ''prezzo'' (Italian), ''precio'' (Spanish), ''preço'' (Portuguese) and ''price'' (English) were ...