Mathbox for Jonathan Ben-Naim |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > Mathboxes > bnj900 | Structured version Visualization version GIF version |
Description: Technical lemma for bnj69 32574. This lemma may no longer be used or have become an indirect lemma of the theorem in question (i.e. a lemma of a lemma... of the theorem). (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.) |
Ref | Expression |
---|---|
bnj900.3 | ⊢ 𝐷 = (ω ∖ {∅}) |
bnj900.4 | ⊢ 𝐵 = {𝑓 ∣ ∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓)} |
Ref | Expression |
---|---|
bnj900 | ⊢ (𝑓 ∈ 𝐵 → ∅ ∈ dom 𝑓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj900.4 | . . . . . 6 ⊢ 𝐵 = {𝑓 ∣ ∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓)} | |
2 | 1 | bnj1436 32403 | . . . . 5 ⊢ (𝑓 ∈ 𝐵 → ∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓)) |
3 | simp1 1137 | . . . . . 6 ⊢ ((𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓) → 𝑓 Fn 𝑛) | |
4 | 3 | reximi 3158 | . . . . 5 ⊢ (∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓) → ∃𝑛 ∈ 𝐷 𝑓 Fn 𝑛) |
5 | fndm 6451 | . . . . . 6 ⊢ (𝑓 Fn 𝑛 → dom 𝑓 = 𝑛) | |
6 | 5 | reximi 3158 | . . . . 5 ⊢ (∃𝑛 ∈ 𝐷 𝑓 Fn 𝑛 → ∃𝑛 ∈ 𝐷 dom 𝑓 = 𝑛) |
7 | 2, 4, 6 | 3syl 18 | . . . 4 ⊢ (𝑓 ∈ 𝐵 → ∃𝑛 ∈ 𝐷 dom 𝑓 = 𝑛) |
8 | 7 | bnj1196 32358 | . . 3 ⊢ (𝑓 ∈ 𝐵 → ∃𝑛(𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛)) |
9 | nfre1 3217 | . . . . . . 7 ⊢ Ⅎ𝑛∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓) | |
10 | 9 | nfab 2906 | . . . . . 6 ⊢ Ⅎ𝑛{𝑓 ∣ ∃𝑛 ∈ 𝐷 (𝑓 Fn 𝑛 ∧ 𝜑 ∧ 𝜓)} |
11 | 1, 10 | nfcxfr 2898 | . . . . 5 ⊢ Ⅎ𝑛𝐵 |
12 | 11 | nfcri 2887 | . . . 4 ⊢ Ⅎ𝑛 𝑓 ∈ 𝐵 |
13 | 12 | 19.37 2234 | . . 3 ⊢ (∃𝑛(𝑓 ∈ 𝐵 → (𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛)) ↔ (𝑓 ∈ 𝐵 → ∃𝑛(𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛))) |
14 | 8, 13 | mpbir 234 | . 2 ⊢ ∃𝑛(𝑓 ∈ 𝐵 → (𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛)) |
15 | nfv 1921 | . . . 4 ⊢ Ⅎ𝑛∅ ∈ dom 𝑓 | |
16 | 12, 15 | nfim 1903 | . . 3 ⊢ Ⅎ𝑛(𝑓 ∈ 𝐵 → ∅ ∈ dom 𝑓) |
17 | bnj900.3 | . . . . . 6 ⊢ 𝐷 = (ω ∖ {∅}) | |
18 | 17 | bnj529 32304 | . . . . 5 ⊢ (𝑛 ∈ 𝐷 → ∅ ∈ 𝑛) |
19 | eleq2 2822 | . . . . . 6 ⊢ (dom 𝑓 = 𝑛 → (∅ ∈ dom 𝑓 ↔ ∅ ∈ 𝑛)) | |
20 | 19 | biimparc 483 | . . . . 5 ⊢ ((∅ ∈ 𝑛 ∧ dom 𝑓 = 𝑛) → ∅ ∈ dom 𝑓) |
21 | 18, 20 | sylan 583 | . . . 4 ⊢ ((𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛) → ∅ ∈ dom 𝑓) |
22 | 21 | imim2i 16 | . . 3 ⊢ ((𝑓 ∈ 𝐵 → (𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛)) → (𝑓 ∈ 𝐵 → ∅ ∈ dom 𝑓)) |
23 | 16, 22 | exlimi 2219 | . 2 ⊢ (∃𝑛(𝑓 ∈ 𝐵 → (𝑛 ∈ 𝐷 ∧ dom 𝑓 = 𝑛)) → (𝑓 ∈ 𝐵 → ∅ ∈ dom 𝑓)) |
24 | 14, 23 | ax-mp 5 | 1 ⊢ (𝑓 ∈ 𝐵 → ∅ ∈ dom 𝑓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∧ w3a 1088 = wceq 1542 ∃wex 1786 ∈ wcel 2114 {cab 2717 ∃wrex 3055 ∖ cdif 3850 ∅c0 4221 {csn 4526 dom cdm 5535 Fn wfn 6345 ωcom 7612 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2711 ax-sep 5177 ax-nul 5184 ax-pr 5306 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-clab 2718 df-cleq 2731 df-clel 2812 df-nfc 2882 df-ne 2936 df-ral 3059 df-rex 3060 df-rab 3063 df-v 3402 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-pss 3872 df-nul 4222 df-if 4425 df-pw 4500 df-sn 4527 df-pr 4529 df-op 4533 df-uni 4807 df-br 5041 df-opab 5103 df-tr 5147 df-eprel 5444 df-po 5452 df-so 5453 df-fr 5493 df-we 5495 df-ord 6186 df-on 6187 df-fn 6353 df-om 7613 |
This theorem is referenced by: bnj906 32494 |
Copyright terms: Public domain | W3C validator |