Interesting mathematical story: the origin of division
""was originally used as a minus sign and has been popular in continental Europe for a long time. Until 163 1 year, the British mathematician Orkut used ":"to represent division or ratio, while others used "-"(except lines) to represent division. Later, the Swiss mathematician Laha, in his book Algebra, formally took 圙 as a division symbol according to the creation of the masses.