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Mirrors > Home > MPE Home > Th. List > nsuceq0 | Structured version Visualization version GIF version |
Description: No successor is empty. (Contributed by NM, 3-Apr-1995.) |
Ref | Expression |
---|---|
nsuceq0 | ⊢ suc 𝐴 ≠ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 4295 | . . . 4 ⊢ ¬ 𝐴 ∈ ∅ | |
2 | sucidg 6263 | . . . . 5 ⊢ (𝐴 ∈ V → 𝐴 ∈ suc 𝐴) | |
3 | eleq2 2901 | . . . . 5 ⊢ (suc 𝐴 = ∅ → (𝐴 ∈ suc 𝐴 ↔ 𝐴 ∈ ∅)) | |
4 | 2, 3 | syl5ibcom 247 | . . . 4 ⊢ (𝐴 ∈ V → (suc 𝐴 = ∅ → 𝐴 ∈ ∅)) |
5 | 1, 4 | mtoi 201 | . . 3 ⊢ (𝐴 ∈ V → ¬ suc 𝐴 = ∅) |
6 | 0ex 5203 | . . . . . 6 ⊢ ∅ ∈ V | |
7 | eleq1 2900 | . . . . . 6 ⊢ (𝐴 = ∅ → (𝐴 ∈ V ↔ ∅ ∈ V)) | |
8 | 6, 7 | mpbiri 260 | . . . . 5 ⊢ (𝐴 = ∅ → 𝐴 ∈ V) |
9 | 8 | con3i 157 | . . . 4 ⊢ (¬ 𝐴 ∈ V → ¬ 𝐴 = ∅) |
10 | sucprc 6260 | . . . . 5 ⊢ (¬ 𝐴 ∈ V → suc 𝐴 = 𝐴) | |
11 | 10 | eqeq1d 2823 | . . . 4 ⊢ (¬ 𝐴 ∈ V → (suc 𝐴 = ∅ ↔ 𝐴 = ∅)) |
12 | 9, 11 | mtbird 327 | . . 3 ⊢ (¬ 𝐴 ∈ V → ¬ suc 𝐴 = ∅) |
13 | 5, 12 | pm2.61i 184 | . 2 ⊢ ¬ suc 𝐴 = ∅ |
14 | 13 | neir 3019 | 1 ⊢ suc 𝐴 ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 Vcvv 3494 ∅c0 4290 suc csuc 6187 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-nul 5202 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-v 3496 df-dif 3938 df-un 3940 df-nul 4291 df-sn 4561 df-suc 6191 |
This theorem is referenced by: 0elsuc 7544 peano3 7597 2on0 8107 oelim2 8215 limenpsi 8686 enp1i 8747 findcard2 8752 fseqdom 9446 dfac12lem2 9564 cfsuc 9673 cfpwsdom 10000 rankcf 10193 dfrdg2 33035 nosgnn0 33160 sltsolem1 33175 dfrdg4 33407 dfsucon 39882 ensucne0 39888 ensucne0OLD 39889 |
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