Now, Prof Bert de With of the Eindhoven University of Technology in the Netherlands and his colleagues have discovered a nano-structure solution to the problem.

BBC: Coating heals itself after damage

The Director the UNESCO Office in Havana discussed with the experts the current situation of the building structure, which must be reinforced with micropiles, the technical solution agreed upon after numerous diagnoses.

UNESCO: MEDIA SERVICES

As Mr Livio explains, Galois's achievement was to show that the structure of these symmetries determines whether the equation has a simple solution.

ECONOMIST: The history of mathematics