The ancient Egyptians had a conception of zero, and used a herioglypical symbol for zero. China had a counting rod system, with an empty space being a zero and Mathematical Treatise in Nine Sections had a round symbol being used for zero. Other authors were familiar with the concept of negative numbers.
These are alll before Indian "invention" (probably be discovery) of zero.
These are alll before Indian "invention" (probably be discovery) of zero.