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Counting rods (筭) are small bars, typically 3–14 cm (1" to 6") long, that were used by mathematicians for calculation in ancient East Asia. They are placed either horizontally or vertically to represent any integer or rational number. The written forms based on them are called rod numerals.
Herodotus (430 BC) had only vaguely heard of the Cassiterides, "from which we are said to have our tin", but did not discount the islands as legendary. [2] Later writers—Posidonius, Diodorus Siculus, [3] Strabo [4] and others—call them smallish islands off ("some way off," Strabo says) the northwest coast of the Iberian Peninsula, which contained tin mines or, according to Strabo, tin and ...
Highlighted map from 1890s indicating the Arginusae islands (now Garip Islands and Kalem Island). Original map by Heinrich Kiepert (1818–1899) In classical antiquity , the Arginusae ( Ancient Greek : Ἀργινοῦσαι Arginousai ) were three islands off the Dikili Peninsula on the coast of modern-day Turkey , famous as the site of the ...
Rod numerals is the only numeric system that uses different placement combination of a single symbol to convey any number or fraction in the Decimal System. For numbers in the units place, every vertical rod represent 1. Two vertical rods represent 2, and so on, until 5 vertical rods, which represents 5.
Six-digit verification codes are a form of two-factor authentication, a process that helps keep your important online accounts secure. For example, you might get a text message or email with a six ...
If the tables are held on single-sided rods, 40 rods are needed in order to multiply 4-digit numbers – since numbers may have repeated digits, four copies of the multiplication table for each of the digits 0 to 9 are needed. If square rods are used, the 40 multiplication tables can be inscribed on 10 rods.
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The Fortunate Isles or Isles of the Blessed [1] [2] (Ancient Greek: μακάρων νῆσοι, makarōn nēsoi) [3] were semi-legendary islands in the Atlantic Ocean, variously treated as a simple geographical location and as a winterless earthly paradise inhabited by the heroes of Greek mythology.