Dido such discussion that Dido caused her thong to be placed as a half circle touching the sea coast at each end (which would add greatly to the perimeter) but the sources mention the thong only and say nothing about the sea. Carthage was the Roman Republic's greatest rival and enemy, and Virgil's Dido in part symbolises this. Even though no Rome existed in her day, Virgil's Dido curses the future progeny of the Trojans. In Italy under the Fascist regime, her figure was demonized, perhaps not only as an anti-Roman figure but because she represented together at least three other
DIDO (software) in solving for the costates in optimal control problems. DIDO generates spectrally accurate solutions whose extremality can be verified using Pontryagin's Minimum Principle. Because no knowledge of pseudospectral methods is necessary to use it, DIDO is often used as a fundamental mathematical tool for solving optimal control problems. That is, a solution obtained from DIDO is treated as a candidate solution for the application of Pontryagin's minimum principle as a necessary condition for optimality. DIDO is used world wide in academia, industry and government laboratories. Thanks to NASA, DIDO was flight-proven in 2006. On November 5, 2006, NASA used DIDO