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Description: Relax the constraint on ax-cc to dominance instead of equinumerosity. (Contributed by Glauco Siliprandi, 26-Jun-2021)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | axccdom.1 | ⊢ ( 𝜑 → 𝑋 ≼ ω ) | |
| axccdom.2 | ⊢ ( ( 𝜑 ∧ 𝑧 ∈ 𝑋 ) → 𝑧 ≠ ∅ ) | ||
| Assertion | axccdom | ⊢ ( 𝜑 → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axccdom.1 | ⊢ ( 𝜑 → 𝑋 ≼ ω ) | |
| 2 | axccdom.2 | ⊢ ( ( 𝜑 ∧ 𝑧 ∈ 𝑋 ) → 𝑧 ≠ ∅ ) | |
| 3 | simpr | ⊢ ( ( 𝜑 ∧ 𝑋 ∈ Fin ) → 𝑋 ∈ Fin ) | |
| 4 | simpr | ⊢ ( ( ( 𝜑 ∧ 𝑋 ∈ Fin ) ∧ 𝑧 ∈ 𝑋 ) → 𝑧 ∈ 𝑋 ) | |
| 5 | 2 | adantlr | ⊢ ( ( ( 𝜑 ∧ 𝑋 ∈ Fin ) ∧ 𝑧 ∈ 𝑋 ) → 𝑧 ≠ ∅ ) |
| 6 | 3 4 5 | choicefi | ⊢ ( ( 𝜑 ∧ 𝑋 ∈ Fin ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 7 | 1 | adantr | ⊢ ( ( 𝜑 ∧ ¬ 𝑋 ∈ Fin ) → 𝑋 ≼ ω ) |
| 8 | isfinite2 | ⊢ ( 𝑋 ≺ ω → 𝑋 ∈ Fin ) | |
| 9 | 8 | con3i | ⊢ ( ¬ 𝑋 ∈ Fin → ¬ 𝑋 ≺ ω ) |
| 10 | 9 | adantl | ⊢ ( ( 𝜑 ∧ ¬ 𝑋 ∈ Fin ) → ¬ 𝑋 ≺ ω ) |
| 11 | 7 10 | jca | ⊢ ( ( 𝜑 ∧ ¬ 𝑋 ∈ Fin ) → ( 𝑋 ≼ ω ∧ ¬ 𝑋 ≺ ω ) ) |
| 12 | bren2 | ⊢ ( 𝑋 ≈ ω ↔ ( 𝑋 ≼ ω ∧ ¬ 𝑋 ≺ ω ) ) | |
| 13 | 11 12 | sylibr | ⊢ ( ( 𝜑 ∧ ¬ 𝑋 ∈ Fin ) → 𝑋 ≈ ω ) |
| 14 | ctex | ⊢ ( 𝑋 ≼ ω → 𝑋 ∈ V ) | |
| 15 | 1 14 | syl | ⊢ ( 𝜑 → 𝑋 ∈ V ) |
| 16 | 15 | adantr | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → 𝑋 ∈ V ) |
| 17 | simpr | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → 𝑋 ≈ ω ) | |
| 18 | breq1 | ⊢ ( 𝑥 = 𝑋 → ( 𝑥 ≈ ω ↔ 𝑋 ≈ ω ) ) | |
| 19 | raleq | ⊢ ( 𝑥 = 𝑋 → ( ∀ 𝑧 ∈ 𝑥 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ↔ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ) | |
| 20 | 19 | exbidv | ⊢ ( 𝑥 = 𝑋 → ( ∃ 𝑔 ∀ 𝑧 ∈ 𝑥 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ↔ ∃ 𝑔 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 21 | 18 20 | imbi12d | ⊢ ( 𝑥 = 𝑋 → ( ( 𝑥 ≈ ω → ∃ 𝑔 ∀ 𝑧 ∈ 𝑥 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ↔ ( 𝑋 ≈ ω → ∃ 𝑔 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ) ) |
| 22 | ax-cc | ⊢ ( 𝑥 ≈ ω → ∃ 𝑔 ∀ 𝑧 ∈ 𝑥 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) | |
| 23 | 21 22 | vtoclg | ⊢ ( 𝑋 ∈ V → ( 𝑋 ≈ ω → ∃ 𝑔 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 24 | 16 17 23 | sylc | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → ∃ 𝑔 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 25 | 15 | mptexd | ⊢ ( 𝜑 → ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ∈ V ) |
| 26 | 25 | adantr | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ∈ V ) |
| 27 | fvex | ⊢ ( 𝑔 ‘ 𝑧 ) ∈ V | |
| 28 | 27 | rgenw | ⊢ ∀ 𝑧 ∈ 𝑋 ( 𝑔 ‘ 𝑧 ) ∈ V |
| 29 | eqid | ⊢ ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) | |
| 30 | 29 | fnmpt | ⊢ ( ∀ 𝑧 ∈ 𝑋 ( 𝑔 ‘ 𝑧 ) ∈ V → ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ) |
| 31 | 28 30 | ax-mp | ⊢ ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 |
| 32 | 31 | a1i | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ) |
| 33 | nfv | ⊢ Ⅎ 𝑧 𝜑 | |
| 34 | nfra1 | ⊢ Ⅎ 𝑧 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) | |
| 35 | 33 34 | nfan | ⊢ Ⅎ 𝑧 ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 36 | id | ⊢ ( 𝑧 ∈ 𝑋 → 𝑧 ∈ 𝑋 ) | |
| 37 | 27 | a1i | ⊢ ( 𝑧 ∈ 𝑋 → ( 𝑔 ‘ 𝑧 ) ∈ V ) |
| 38 | 29 | fvmpt2 | ⊢ ( ( 𝑧 ∈ 𝑋 ∧ ( 𝑔 ‘ 𝑧 ) ∈ V ) → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) = ( 𝑔 ‘ 𝑧 ) ) |
| 39 | 36 37 38 | syl2anc | ⊢ ( 𝑧 ∈ 𝑋 → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) = ( 𝑔 ‘ 𝑧 ) ) |
| 40 | 39 | adantl | ⊢ ( ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ∧ 𝑧 ∈ 𝑋 ) → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) = ( 𝑔 ‘ 𝑧 ) ) |
| 41 | rspa | ⊢ ( ( ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ∧ 𝑧 ∈ 𝑋 ) → ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) | |
| 42 | 41 | adantll | ⊢ ( ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ∧ 𝑧 ∈ 𝑋 ) → ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 43 | 2 | adantlr | ⊢ ( ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ∧ 𝑧 ∈ 𝑋 ) → 𝑧 ≠ ∅ ) |
| 44 | id | ⊢ ( ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) → ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) | |
| 45 | 42 43 44 | sylc | ⊢ ( ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ∧ 𝑧 ∈ 𝑋 ) → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) |
| 46 | 40 45 | eqeltrd | ⊢ ( ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) ∧ 𝑧 ∈ 𝑋 ) → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) |
| 47 | 46 | ex | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ( 𝑧 ∈ 𝑋 → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 48 | 35 47 | ralrimi | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ∀ 𝑧 ∈ 𝑋 ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) |
| 49 | 32 48 | jca | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 50 | fneq1 | ⊢ ( 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) → ( 𝑓 Fn 𝑋 ↔ ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ) ) | |
| 51 | nfcv | ⊢ Ⅎ 𝑧 𝑓 | |
| 52 | nfmpt1 | ⊢ Ⅎ 𝑧 ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) | |
| 53 | 51 52 | nfeq | ⊢ Ⅎ 𝑧 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) |
| 54 | fveq1 | ⊢ ( 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) → ( 𝑓 ‘ 𝑧 ) = ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ) | |
| 55 | 54 | eleq1d | ⊢ ( 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) → ( ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ↔ ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 56 | 53 55 | ralbid | ⊢ ( 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) → ( ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ↔ ∀ 𝑧 ∈ 𝑋 ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 57 | 50 56 | anbi12d | ⊢ ( 𝑓 = ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) → ( ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ↔ ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 58 | 57 | spcegv | ⊢ ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ∈ V → ( ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( ( 𝑧 ∈ 𝑋 ↦ ( 𝑔 ‘ 𝑧 ) ) ‘ 𝑧 ) ∈ 𝑧 ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 59 | 26 49 58 | sylc | ⊢ ( ( 𝜑 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 60 | 59 | adantlr | ⊢ ( ( ( 𝜑 ∧ 𝑋 ≈ ω ) ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 61 | 60 | ex | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → ( ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 62 | 61 | exlimdv | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → ( ∃ 𝑔 ∀ 𝑧 ∈ 𝑋 ( 𝑧 ≠ ∅ → ( 𝑔 ‘ 𝑧 ) ∈ 𝑧 ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) ) |
| 63 | 24 62 | mpd | ⊢ ( ( 𝜑 ∧ 𝑋 ≈ ω ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 64 | 13 63 | syldan | ⊢ ( ( 𝜑 ∧ ¬ 𝑋 ∈ Fin ) → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |
| 65 | 6 64 | pm2.61dan | ⊢ ( 𝜑 → ∃ 𝑓 ( 𝑓 Fn 𝑋 ∧ ∀ 𝑧 ∈ 𝑋 ( 𝑓 ‘ 𝑧 ) ∈ 𝑧 ) ) |