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The Leitner system [1] [2] [3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [ 4 ] [ 5 ] It is a simple implementation of the principle of spaced repetition , where cards are reviewed at increasing intervals.
The open manner and timing of the publication of these test dates was criticised by a group of Indian mathematical historians (Plofker et al. 2017 [1] and Houben 2018 §3 [2]). Up until Sep 2024 the manuscript is known to have contained the earliest known Indian use of a zero symbol.
The date used as the end of the ancient era is arbitrary. The transition period from Classical Antiquity to the Early Middle Ages is known as Late Antiquity.Late Antiquity is a periodization used by historians to describe the transitional centuries from Classical Antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world: generally from the end of the Roman Empire's ...
List of years; Timelines of world history; List of timelines; Chronology; See calendar and list of calendars for other groupings of years.; See history, history by period, and periodization for different organizations of historical events.
Greek mathematics greatly refined the methods (especially through the introduction of deductive reasoning and mathematical rigor in proofs) and expanded the subject matter of mathematics. [5] The ancient Romans used applied mathematics in surveying , structural engineering , mechanical engineering , bookkeeping , creation of lunar and solar ...
Theon of Alexandria (/ ˌ θ iː ə n,-ɒ n /; Ancient Greek: Θέων ὁ Ἀλεξανδρεύς; c. AD 335 – c. 405) was a Greek [1] scholar and mathematician who lived in Alexandria, Egypt. He edited and arranged Euclid 's Elements and wrote commentaries on works by Euclid and Ptolemy .
Even numbers are always 0, 2, or 4 more than a multiple of 6, while odd numbers are always 1, 3, or 5 more than a multiple of 6. Well, one of those three possibilities for odd numbers causes an issue.
[11] Europe (Including area of the former USSR) Americas Asia (including Australasia) Africa World Clark 44,500 3,000 185,000 23,000 225,500 Durand