Logic

Forcing, Iterated Ultrapowers, and Turing Degrees by Chitat Chong, Qi Feng, Theodore A Slaman, W Hugh Woodin, Yue

By Chitat Chong, Qi Feng, Theodore A Slaman, W Hugh Woodin, Yue Yang

This quantity provides the lecture notes of brief classes given through 3 best specialists in mathematical good judgment on the 2010 and 2011 Asian Initiative for Infinity good judgment summer time colleges. the foremost issues lined set concept and recursion thought, with specific emphasis on forcing, internal version thought and Turing levels, providing a large review of rules and methods brought in modern examine within the box of mathematical common sense.

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Extra resources for Forcing, Iterated Ultrapowers, and Turing Degrees

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This only depends on γi for pi ≤P pj . If such an extension exists, put Ak (x) = A 1 − Φe j (x). If there is no such extension, do nothing. Then, go to stage s + 1. To verify that the construction satisfies all the requirements, for Rk,j,e consider the stage s = k, j, e . Either we extended some γ or we did not. A If we extended some γ, then there is x such that Φe j (x) ↓= Ak (x). If we A did not, then no such extension exists and since Aj extends γj,s , Φe j (x) ↑. 10: Every countable partial order can be embedded in D.

9 The direct extension ordering ≤∗ on Qn is defined to be ≤ 0 ∪ ≤1 . 10 Let p, q ∈ Qn . Then p ≤ q iff either (1) p ≤∗ q or (2) p = a, A, f ∈ Qn0 , q ∈ Qn1 and the following holds: (a) (b) (c) (d) q⊇f dom(q) ⊇ a q(max(a)) ∈ A for every β ∈ a q(β) = πmax(a),β (q(max(a))). e. the Cohen forcing. However, the following basic facts relate it to the Prikry type forcing notion. 22 M. 1. 11 Qn , ≤∗ is κn -closed. e. for every p ∈ Qn and every statement σ of the forcing language there is q ≥∗ p deciding σ.

8 Qn = Qn0 ∪ Qn1 . 9 The direct extension ordering ≤∗ on Qn is defined to be ≤ 0 ∪ ≤1 . 10 Let p, q ∈ Qn . Then p ≤ q iff either (1) p ≤∗ q or (2) p = a, A, f ∈ Qn0 , q ∈ Qn1 and the following holds: (a) (b) (c) (d) q⊇f dom(q) ⊇ a q(max(a)) ∈ A for every β ∈ a q(β) = πmax(a),β (q(max(a))). e. the Cohen forcing. However, the following basic facts relate it to the Prikry type forcing notion. 22 M. 1. 11 Qn , ≤∗ is κn -closed. e. for every p ∈ Qn and every statement σ of the forcing language there is q ≥∗ p deciding σ.

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