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Jan 16, 2020 at 16:46 vote accept Ruizhi Yang
Jan 16, 2020 at 8:45 review Close votes
Jan 21, 2020 at 3:05
Jan 15, 2020 at 21:49 answer added Noah Schweber timeline score: 2
Jan 15, 2020 at 21:46 comment added Noah Schweber I think the "PA$^*$" in your opener should just be PA.
Jan 15, 2020 at 10:29 comment added Ruizhi Yang $W_e$ is the range of $\Phi_e$ by fixing an enumeration of Turing machines $\{\Phi_e\}_e$. $\Sigma_e$ is a typo (fixed), which should be $W_e$. $PA$ stands for Peano Arithmetic. I am sorry for the ambiguities.
Jan 15, 2020 at 10:27 history edited Ruizhi Yang CC BY-SA 4.0
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Jan 15, 2020 at 8:00 comment added Emil Jeřábek I don’t understand the notation. What is $W_e$, $\Sigma_e$, and $PA^*$?
Jan 15, 2020 at 6:30 history asked Ruizhi Yang CC BY-SA 4.0