Similar but Not the Same: Various Versions of ♣Do Not Coincide

نویسندگان

  • Saharon Shelah
  • MIRNA DZAMONJA
چکیده

We consider various versions of the 4 principle. This principle is a known consequence of 0. It is well known that or is not sensitive to minor changes in its definition, e.g.. changing the guessing requirement form "guessing exactly" to "guessing module a finite set". We show however. that this is not true for 4. We consider some other variants of 4 as well. ?

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تاریخ انتشار 1999