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...r designed by a commission assembled by Pope Gregory XIII in the sixteenth century."}}{{efn|Many countries that use other calendars for religious purposes use ...ays; when Russia and Greece did so (for their civil calendars) in the 20th century, the jump was 13 days. For other countries and territories, see [[List of a ...

...r the [[Ancient Greece|Greek]] philosopher [[Pythagoras]], born around 570 BC. The theorem has been [[Mathematical proof|proved]] numerous times by many :<math> \frac{BC}{AB}=\frac{BH}{BC} \text{ and }\frac{AC}{AB}=\frac{AH}{AC}.</math> ...

...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 ...

...chool]] theorists<ref>[[Hans-Georg Backhaus]], ''Dialektik der Wertform'', 2nd. edition. Freiburg: ça ira Verlag, 2011. Riccardo Bellofiore and Tommaso Re ...ic method", in: Ronald L. Meek, ''Studies in the labour theory of value'', 2nd edition. New York: Monthly Review Press, 1976, p. 302f; Jindřich Zelený, '' ...