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7
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A proposed axiom of Laver (updated)
A few months back, I posted a question asking about a proposed axiom of Laver's and I, unfortunately, left out a critical piece. Here is the full axiom:
(L) Some elementary embedding $j:V_{\lambda+1 …
9
votes
1
answer
1k
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Critical points of rank-into-rank embeddings
$\DeclareMathOperator{\crit}{\operatorname{crit}}$A rank-into-rank embedding is a non-trivial elementary embedding from a rank initial segment of $V$ into itself: $j:V_\delta\prec V_\delta$. Define th …
2
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Can one force there to be an elementary embedding $j:V_{\lambda}\rightarrow V_{\lambda}$ for...
Given Victoria's wonderful comment, I wonder if the following small forcing example is relevant to your question. The argument is from Laver's article "Certain very large cardinals are not created in …
10
votes
1
answer
482
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Generic Extensions and $L(V_{\lambda+1})$
Suppose $\lambda$ is a strong limit cardinal of cofinality $\omega$ and for $A$ a transitive set, define $L(A)$ in the usual fashion by setting
$$L_0(A)=A;$$
$$L_{\alpha+1}(A) = L_\alpha (A)\cup \mat …
7
votes
1
answer
494
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Elementary Embeddings and Relative Constructibility
Suppose $$j:M\prec N$$ is a non-trivial elementary embedding. Under what conditions on the sets (classes?) $M$ and $N$ (or even the critical point of $j$) does $j$ extend to an elementary embedding $$ …
5
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1
answer
590
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Solovay's Theorem on Partitions of Stationary Sets and Weak Choice Principles
There is a weak choice principle called $DC_\lambda$ which holds in $L(V_{\lambda+1})$ under the assumption of a non-trivial elementary embedding $$j:L(V_{\lambda+1})\prec L(V_{\lambda+1})$$ and it is …
3
votes
Very Large Cardinal Axioms and Continuum Hypothesis
There are some candidate axioms that are beginning to surface on the internet that appear to have large cardinal characteristics and could potentially settle questions like the CH. If they are consist …
6
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What is the definition of a large cardinal axiom?
While I think I agree with Tim Chow and Joel Hamkins in some of their comments above regarding a single formal definition of what it is to be a large cardinal, I want to suggest that a large cardinal …