It was ARYABHATTAR, an Indian mathematician.
Ancient Egyptians and Mayans also understood the concepts of nothing and negativity, but the western world got the idea from Aryabhattar's writing.
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The answer is : Pingala
He was an Indian mathematician.
His book Chhandah-shastra contains the first known use of zero.
Pingala presents the first known description of a binary numeral system. He described the binary numeral system in connection with the listing of Vedic meters with short and long syllables. His work also contains the basic ideas of maatraameru (Fibonacci number) and meruprastaara (Pascal's triangle).
Now there were many cases before of 0 being used (or something like 0), but this was the first fully recorded version of 0 in history.
decimal system and zero are the contribution of the Indians to the humanity.
Zero
If variables have zero correlation, they do not have a linear relationship. Zero correlation shows that two things were not found to be related.
aryabatta found that zero is a number and ramanujan said the value of it
Because the solutions are found on the x axis when y is zero.