The Empire was established in 1336 by Harihara I and his brother Bukka Raya I of Sangama Dynasty. The empire rose to prominence as a culmination of attempts by the southern powers to ward off Islamic invasions by the end of the 13th century. The empire is named after its capital city of Vijayanagara, whose ruins surround present day Hampi, now a World Heritage Site in Karnataka, India. The empire's legacy includes many monuments spread over South India, the best known of which is the group at Hampi. The previous temple building traditions in South India came together in the Vijayanagara Architecture style. The mingling of all faiths and vernaculars inspired architectural innovation of Hindu temple construction, first in the Deccan and later in the Dravidian idioms using the local granite. South Indian mathematics flourished under the protection of the Vijayanagara Empire in Kerala. The south Indian mathematician Madhava of Sangamagrama founded the famous Kerala school of astronomy and mathematics in the 14th century which produced a lot of great south Indian mathematicians like Parameshvara, Nilakantha Somayaji and Jyesthadeva in medieval south India. Efficient administration and vigorous overseas trade brought new technologies such as water management systems for irrigation. The empire's patronage enabled fine arts and literature to reach new heights in Kannada, Telugu, Tamil and Sanskrit, while Carnatic music evolved into its current form. The Vijayanagara Empire created an epoch in South Indian history that transcended regionalism by promoting Hinduism as a unifying factor. The empire reached its peak during the rule of Sri Krishnadevaraya when Vijayanagara armies were consistently victorious. The empire annexed areas formerly under the Sultanates in the northern Deccan and the territories in the eastern Deccan, including Kalinga, while simultaneously maintaining control over all its subordinates in the south. Many important monuments were either completed or commissioned during the time of Krishna Deva Raya. Vijayanagara went into decline after the defeat in the Battle of Talikota (1565).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What mathematician founded the Kerala school of astronomy?
Ah, so.. Madhava of Sangamagrama

Most French rulers since the Middle Ages made a point of leaving their mark on a city that, contrary to many other of the world's capitals, has never been destroyed by catastrophe or war. In modernising its infrastructure through the centuries, Paris has preserved even its earliest history in its street map.[citation needed] At its origin, before the Middle Ages, the city was composed around several islands and sandbanks in a bend of the Seine; of those, two remain today: the ile Saint-Louis, the ile de la Cite; a third one is the 1827 artificially created ile aux Cygnes. Modern Paris owes much to its late 19th century Second Empire remodelling by the Baron Haussmann: many of modern Paris' busiest streets, avenues and boulevards today are a result of that city renovation. Paris also owes its style to its aligned street-fronts, distinctive cream-grey "Paris stone" building ornamentation, aligned top-floor balconies, and tree-lined boulevards. The high residential population of its city centre makes it much different from most other western global cities.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When was ile aux Cygnes created?
Ah, so.. 1827

A new delimitation of the federal territory keeps being debated in Germany, though "Some scholars note that there are significant differences among the American states and regional governments in other federations without serious calls for territorial changes ...", as political scientist Arthur B. Gunlicks remarks. He summarizes the main arguments for boundary reform in Germany: "... the German system of dual federalism requires strong Lander that have the administrative and fiscal capacity to implement legislation and pay for it from own source revenues. Too many Lander also make coordination among them and with the federation more complicated ...". But several proposals have failed so far; territorial reform remains a controversial topic in German politics and public perception.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What does the system of regional government need in America?
Ah, so..
unanswerable