There is no one mathematician credited with the invention of multiplication. Multiplication has been documented in Egyptian, Greek, Indian and Chinese civilizations.
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William Oughtred
William Jones, a Welsh mathematician, first used the pi symbol in 1706.
This is called a Fibonacci series ( after the mathematician who came up with it).
pythagoras. he had lots of different theorums, one named after him in fact(pythagorases theorum) he came up wth the symbol from ancient greek drawings.
Robert Recorde, who designed the equals sign, introduced plus and minus in 1557. Brahmagupta was an Indian mathematician who invented the multiplication sign around the 19th century. Johann Rahn first used the division sign in his book Teutshe algebra in 1659.