Read the following excerpt and answer the question that follows:

"It was an intensely active period in mathematics which encouraged the development of astronomy as a precise science."

(Source: https://zh.unesco.org/silkroad/sites/defau/t/files/knowledgebankartic/e/vollll%20si/k%20roadthe%20gupta%20kingdom.pdf)

Name the three greatest mathematicians and astronomers of the Gupta period.

Where are the best specimens of the Gupta paintings found?

Which Gupta king was known as Vikramaditya?

What was the main source of income in the Gupta Empire?