![]() In the 20th century, the three-dot notation for 'therefore' became very rare in continental Europe, but it remains popular in Anglophone countries. 211 Other authors in the 18th century also used three dots in a triangle shape to signify "therefore", but as with Rahn, there wasn't much in the way of consistency as to how the triangle was oriented because with its current meaning appears to have originated in the 19th century. According to Cajori, A History of Mathematical Notations, Johann Rahn used both the therefore and because signs to mean "therefore" in the German edition of Teutsche Algebra (1659) the therefore sign was prevalent with the modern meaning, but in the 1668 English edition Rahn used the because sign more often to mean "therefore". ![]()
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