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Singularity theorems constitute a major milestone of relativity. Theygenerated a panoply of fertile lines of research with dazzling physicalconsequences.  (Los teoremas de singularidades constituyen uno de los mayores hitos de larelatividad. Generaron una panoplia de f\'ertiles l\'ineas de investigaci\'oncon consecuencias f\'isicas deslumbrantes).

Hoyos negros y sus misteriosos interiores (Black holes and their mysterious interiors)