Why was the period of the golden age of india, also known as the gupta empire, given this honorable name?

1) they advanced mathematics by establishing the use of numbers 1 through 9 and zero as a placeholder.
2) they followed astronomy but came short of concluding the earth rotates on an axis.
3) buddhist and hindu shrines and temples with beautiful architecture are evidence of magnificent work.
4) paintings using the technique of fresco were copied by neighboring countries.
5) the ancient indian literature, written in sanskrit, peaked during this empire.

1) They advanced mathematics by establishing the use of numbers 1 through 9 and zero as a placeholder.

Explanation:

The Gupta Empire was an ancient Indian empire, which existed from approximately 320 to 550 and covered much of the Indian subcontinent.  The peace and prosperity created under the leadership of the guptas allowed the search for artistic and scientific efforts. This period is called the Golden Age of India and was marked by extensive inventions and discoveries in the areas of science and technology, engineering, art, dialectics, literature, logic, mathematics, astronomy, religion and philosophy that crystallized elements that are generally known as Hindu culture.

It is believed that it is due to the Gupta Empire, the invention of the concepts of zero and infinity and the symbols for what would come to be known as the Arabic numerals (1-9).

The empire came to an end with the attack of White Huns from Central Asia. A minor lineage of the gupta clan, which continued to reign in Magadha after the disintegration of the empire, was finally overthrown by the Harshavardhana, which reunified the northern subcontinent in the first half of the seventh century.

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.