Why was the Indian concept of zero significant?

The invention of zero was a hugely significant mathematical development, one that is fundamental to calculus, which made physics, engineering and much of modern technology possible. In Gwalior, a congested city in the centre of the India, an 8th-Century fort rises with medieval swagger on a plateau in the town's heart.

Explanation:

answer; /// all of the above;

answer; vygtosky's theory;