Dido, Queen of Carthage (opera) but has fallen in love with the Trojan warrior Aeneas, who had been shipwrecked on the shores of her city. Iarbas appears (disguised as his own ambassador and using the name "Orodes") to warn Dido that Aeneas cannot become King of Carthage. Nevertheless, Dido refuses to marry Iarbas. Although Aeneas is now in love with Dido, he asks her sister Anna to tell Dido of his plans to leave Carthage for Italy. War then breaks out between Aeneas and Iarbas. Dido convinces Aeneas to become her husband and share the throne of Carthage. However, when the ghost of Aeneas' father
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