1955
The first decimal system was introduced in the 4th Century BC by the Sumerians of Mesopotamia, to whom the invention of writing is credited. They based their numerical system on powers of 60 subdivided into multiples of 10. It was from this system that Sumero-Babylonians developed the time system that we use today: each hour is divided into 60 minutes, which are divided into 60 seconds. However, they did not have a symbol for zero, which was introduced by Arabians only toward the end of the first millennium BC. It is thought that the zero could have been devised by Indian Hindu mathematicians because the concept of nothing was important in their early religion and philosophy.
Bhāskara was a 7th century Indian mathematician, who was apparently the first to write numbers in the Hindu-Arabic decimal system with a circle for the zero, and who gave a unique and remarkable rational approximation of the sine function in his commentary on Aryabhata's work.
Teano , wife of Pythgorus is considered as the first lady mathematician in the world.
THe Gupta Empire
it was karen velasquez she was the first to do this if it wernt for her we wudnt have decimals tht would help us in our future :)
1955
Indians introduced it.
Brackets were first used in ancient Greece by the mathematician Apollonius of Perga in the 3rd century BC. He introduced them to denote grouping in mathematical expressions.
15th February 1971, the UK introduced decimal currency
germany germany
The idea of Cartesian coordinates was the brainchild of the French mathematician and philosopher Rene' Descartes in the early 17th century.
The first decimal system was introduced in the 4th Century BC by the Sumerians of Mesopotamia, to whom the invention of writing is credited. They based their numerical system on powers of 60 subdivided into multiples of 10. It was from this system that Sumero-Babylonians developed the time system that we use today: each hour is divided into 60 minutes, which are divided into 60 seconds. However, they did not have a symbol for zero, which was introduced by Arabians only toward the end of the first millennium BC. It is thought that the zero could have been devised by Indian Hindu mathematicians because the concept of nothing was important in their early religion and philosophy.
Decimal currency was first introduced in Australia on 14 February 1966. The new Australian dollar replaced the Australian pound, which was different to the Pound Sterling.
Bhāskara was a 7th century Indian mathematician, who was apparently the first to write numbers in the Hindu-Arabic decimal system with a circle for the zero, and who gave a unique and remarkable rational approximation of the sine function in his commentary on Aryabhata's work.
I assume you mean "When was the first operating system introduced?" Seems to be in the 1950s. See the link below for a very detailed page.
Decimal number system