Coherent sequences and threads

• Autores: Ernest Schimmerling
• Localización: Advances in mathematics, ISSN 0001-8708, Vol. 216, Nº 1, 2007, págs. 89-117
• Idioma: inglés
• DOI: 10.1016/j.aim.2007.05.005
• Texto completo no disponible (Saber más ...)
• Resumen

  • The combinatorial principle ?(?) says that there is a coherent sequence of length ? that cannot be threaded. If ?=?+, then the related principle ?? implies ?(?). Let ?2 and X?. Assume both ?(?) and ?? fail. Then there is an inner model N with a proper class of strong cardinals such that XN. If, in addition, ?20 and n