- The German mathematician Michael Stifel (1485 - 1567) in his Arithmetica Integra popularized the symbols "+ " and" - " displacing the signs" p "(plus) and" m " (Minus). According to the English mathematician Rey Pastor (1888-1962), the "+" and "-" was first used by the German scientist Widmann (1460-1498).
- Recode Robert (1510-1558), English mathematician and physician, was the creator of symbol "=" , since for him, no two things more equal than two lines parallel lines.
- The symbol known as "root" appeared for the first time in a German book of algebra, 1525. Prior to designate the root of a number, literally wrote "rai of ....". In short, it was simply used the letter "r", but when the numbers were large, stretched the same horizontal line, giving rise to the symbol we use today.
- mathematician Francois Viète (1540-1603) was the first to use letters to designate the unknowns and the constants.
- A Thomas Harriot (1560-1621) we owe the current signs "<" and"> " and use of " · " as a symbol for multiplication.
- multiplication symbols " x "and division " " were introduced by the mathematician William Oughtred (1574-1660) in 1657.
- The integral symbol was proposed by Gottfried Leibniz (1646-1716) and extracted from the Latin word "summa" taking your initial. A Leibniz owe many more signs notational, as "dx" and it was he who popularized the "·" as a sign of multiplication.
- For more information click on this link: The development of mathematical signs
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