Brahmagupta revolutionized both math and astronomy in the 7th century. His writings on the number zero treated the concept as a number that could be inserted into equations, and not as a stand-in for a "lack" of something else. He also dealt with the concept of negative numbers, referring to them as "debt."
Brahmagupta And The Concept Of Zero
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Key Facts In This Video
Categorically, zero is an even number. 01:19
In Florence during the Crusades, the use of the number zero was banned because it was thought to be connected to the devil. 02:28
Instead of using a symbol for zero, Babylonians would insert a space. 05:01