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{{Short description|German mathematician (1919–2006)}} | citizenship = [[Germans|German]] ...

...the human population will begin to decline in the second half of the 21st century.<ref>{{Cite news |last1=Cave |first1=Damien |last2=Bubola |first2=Emma |las ...s, broken down by continents, were published in the first half of the 19th century, at 600 million to 1&nbsp;billion in the early 1800s and 800&nbsp;million t ...

...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> ...

The '''value-form''' or '''form of value''' (''"Wertform"'' in German) <ref>In English, one would normally say "the form of value", "the form tha ...s/]; Roberto Fineschi, "Dialectic of the Commodity and Its Exposition: The German Debate in the 1970s — A Personal Survey". In: Riccardo Bellofiore & Roberto ...

...|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 ...