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...ters during the time of the reformer Judean king [[Josiah]] in 7th century BC.<ref name=gilad/>{{sfn|Coogan|2007|p=314 Hebrew Bible}} This chapter focuse ...tion, which includes the [[Codex Cairensis]] (895), [[Aleppo Codex]] (10th century), and [[Leningrad Codex|Codex Leningradensis]] (1008).{{sfn|Würthwein|1995| ...

...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> ...

...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 ...