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Mirrors > Home > MPE Home > Th. List > eleenn | Structured version Visualization version GIF version |
Description: If 𝐴 is in (𝔼‘𝑁), then 𝑁 is a natural. (Contributed by Scott Fenton, 1-Jul-2013.) |
Ref | Expression |
---|---|
eleenn | ⊢ (𝐴 ∈ (𝔼‘𝑁) → 𝑁 ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i 3879 | . 2 ⊢ (𝐴 ∈ (𝔼‘𝑁) → ¬ (𝔼‘𝑁) = ∅) | |
2 | ovex 6577 | . . . . 5 ⊢ (ℝ ↑𝑚 (1...𝑛)) ∈ V | |
3 | df-ee 25571 | . . . . 5 ⊢ 𝔼 = (𝑛 ∈ ℕ ↦ (ℝ ↑𝑚 (1...𝑛))) | |
4 | 2, 3 | dmmpti 5936 | . . . 4 ⊢ dom 𝔼 = ℕ |
5 | 4 | eleq2i 2680 | . . 3 ⊢ (𝑁 ∈ dom 𝔼 ↔ 𝑁 ∈ ℕ) |
6 | ndmfv 6128 | . . 3 ⊢ (¬ 𝑁 ∈ dom 𝔼 → (𝔼‘𝑁) = ∅) | |
7 | 5, 6 | sylnbir 320 | . 2 ⊢ (¬ 𝑁 ∈ ℕ → (𝔼‘𝑁) = ∅) |
8 | 1, 7 | nsyl2 141 | 1 ⊢ (𝐴 ∈ (𝔼‘𝑁) → 𝑁 ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 ∅c0 3874 dom cdm 5038 ‘cfv 5804 (class class class)co 6549 ↑𝑚 cmap 7744 ℝcr 9814 1c1 9816 ℕcn 10897 ...cfz 12197 𝔼cee 25568 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-iota 5768 df-fun 5806 df-fn 5807 df-fv 5812 df-ov 6552 df-ee 25571 |
This theorem is referenced by: eleei 25577 eedimeq 25578 brbtwn 25579 brcgr 25580 eleesub 25591 eleesubd 25592 axsegconlem1 25597 axsegconlem8 25604 axeuclidlem 25642 brsegle 31385 |
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