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Feb. 14th, 2008|07:52 pm |
da i s kvantorom suschestvobanija tozhe problemy. Esli realizujuschee naturalnoe chislo uzhe najdeno - to ponjatno, a esli net - to chto? naprimer neg(Con(NF))?
Polovina logikov ischet primer, drugaja polovina - naoborot, probuet dokazat' ZF |- Con(NF) ili chto esche kto-nibud' |-Con(NF).
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