○○○ 0850± Scandinavia ⪢⪢
During the 9th
century, Scandinavia in northern Europe is populated by, among others, the Vikings, excellent sailors who explore in all directions to plunder but also to develope trade routes. #bookmark
http://qindex.info/i.php?x=5285
• 0750± positional notation
By the 8th
century, Indian mathematicians had perfected positional notation and over the next several centuries, Arab merchants, scholars and conquerors began to spread it into Europe.
-- vigesimal, Maghreb, Hebrew, glyph, Aztecs, duodecimal, sexigesimal
http://qindex.info/i.php?x=4984