theorem A.26 Diagonal lemma

open in the book · appendices/A-long-proofs.tex:2349 · p. 2803

Rests on

depends_on proposition A.15 Syntax is computable ¶
- depends_on definition 3.93 Computable function, decidable set ¶
  - depends_on definition 3.92 Turing machine ¶
- depends_on definition 3.81 Effective axiomatization ¶
  - depends_on definition 3.80 Formal system ¶
- depends_on equation A.120 eq:app-inc-coding ¶
- proves proof app:A-long-proofs@proof-12 ¶
depends_on theorem A.17 Representability ¶
- depends_on definition A.16 Representability ¶
  - depends_on definition 3.80 Formal system ¶ ↺
- depends_on definition 3.93 Computable function, decidable set ¶ ↺
- depends_on lemma A.20 $\Sigma_{1}$-completeness ¶
  - depends_on definition A.18 $\Delta_{0}$ and $\Sigma_{1}$ ¶
    - depends_on equation A.119 eq:app-inc-order ¶
  - depends_on lemma A.19 Numerals behave ¶
    - depends_on definition 3.83 Peano arithmetic ¶
      - depends_on axiom 3.33 Peano axioms ¶
      - depends_on axiom 3.34 Principle of induction ¶
      - depends_on definition 3.80 Formal system ¶ ↺
    - depends_on equation A.118 eq:app-inc-Q-successor ¶
    - depends_on equation A.119 eq:app-inc-order ¶ ↺
    - proves proof app:A-long-proofs@proof-13 ¶
  - depends_on proposition 3.22 Algebra of propositions ¶
    - depends_on definition 3.17 Logical equivalence ¶
      - depends_on definition 3.12 Biconditional ¶
      - depends_on definition 3.14 Tautology ¶
    - depends_on definition 3.6 Truth table ¶
    - proves proof ch:01-logic-sets@proof-4 ¶
  - proves proof app:A-long-proofs@proof-14 ¶
- depends_on theorem A.25 thm:app-inc-primrec ¶
  - depends_on definition A.16 Representability ¶ ↺
  - depends_on lemma A.23 Sequence lemma ¶
    - depends_on definition A.22 Gödel's $\beta$ ¶
    - depends_on lemma A.21 Chinese remainder theorem ¶
      - proves proof app:A-long-proofs@proof-15 ¶
    - proves proof app:A-long-proofs@proof-16 ¶
  - depends_on lemma A.24 lem:app-inc-beta-delta0 ¶
    - depends_on definition A.22 Gödel's $\beta$ ¶ ↺
    - depends_on definition A.18 $\Delta_{0}$ and $\Sigma_{1}$ ¶ ↺
    - depends_on lemma A.19 Numerals behave ¶ ↺
    - proves proof app:A-long-proofs@proof-17 ¶
  - depends_on lemma A.19 Numerals behave ¶ ↺
  - depends_on lemma A.20 $\Sigma_{1}$-completeness ¶ ↺
  - proves proof app:A-long-proofs@proof-18 ¶
- proves proof app:A-long-proofs@proof-19 ¶
proves proof app:A-long-proofs@proof-20 ¶

Supports

depends_on theorem A.27 Rosser ¶

Neighborhood

Every logical edge within two steps of this node.

declared and complete
partly declared
a check failed
not graded
declared in the source
inferred from structure

Edges

type	direction	node	provenance	where
`depends_on`	→	Syntax is computable	declared	appendices/A-long-proofs.tex:2356
`depends_on`	→	Representability	declared	appendices/A-long-proofs.tex:2356
`depends_on`	←	Rosser	declared	appendices/A-long-proofs.tex:2428
`proves`	←	app:A-long-proofs@proof-20	declared	appendices/A-long-proofs.tex:2359