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vhspdfg
  • Member for 8 years, 3 months
  • Last seen more than a month ago
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17
If $U,D$ are $\kappa$-complete nonprincipal ultrafilters on $\kappa$ and $j_U(U) = j_D(D)$, is $U=D$?
Apr 4, 2016
question
16
Is there a consistent arithmetically definable extension of PA that proves its own consistency?
Feb 12, 2016
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10
Is there a forcing extension $M[G]$ of $M$ that adds a new $\omega$-sized subset to $\omega_2$ without adding any new subsets of $\omega$?
7
Question about collapsing cardinals
7
If $U,D$ are $\kappa$-complete nonprincipal ultrafilters on $\kappa$ and $j_U = j_D$, is $U=D$?
7
"Forcing a Cohen real inside a Cohen real" not a product forcing
6
Is there is a real $r$ and a countable transitive model $M$ such that $r$ is not in any forcing extension of $M$?