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Mirrors > Home > MPE Home > Th. List > nfeld | Structured version Visualization version GIF version |
Description: Hypothesis builder for elementhood. (Contributed by Mario Carneiro, 7-Oct-2016.) |
Ref | Expression |
---|---|
nfeqd.1 | ⊢ (𝜑 → Ⅎ𝑥𝐴) |
nfeqd.2 | ⊢ (𝜑 → Ⅎ𝑥𝐵) |
Ref | Expression |
---|---|
nfeld | ⊢ (𝜑 → Ⅎ𝑥 𝐴 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-clel 2606 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑦(𝑦 = 𝐴 ∧ 𝑦 ∈ 𝐵)) | |
2 | nfv 1830 | . . 3 ⊢ Ⅎ𝑦𝜑 | |
3 | nfcvd 2752 | . . . . 5 ⊢ (𝜑 → Ⅎ𝑥𝑦) | |
4 | nfeqd.1 | . . . . 5 ⊢ (𝜑 → Ⅎ𝑥𝐴) | |
5 | 3, 4 | nfeqd 2758 | . . . 4 ⊢ (𝜑 → Ⅎ𝑥 𝑦 = 𝐴) |
6 | nfeqd.2 | . . . . 5 ⊢ (𝜑 → Ⅎ𝑥𝐵) | |
7 | 6 | nfcrd 2757 | . . . 4 ⊢ (𝜑 → Ⅎ𝑥 𝑦 ∈ 𝐵) |
8 | 5, 7 | nfand 1814 | . . 3 ⊢ (𝜑 → Ⅎ𝑥(𝑦 = 𝐴 ∧ 𝑦 ∈ 𝐵)) |
9 | 2, 8 | nfexd 2153 | . 2 ⊢ (𝜑 → Ⅎ𝑥∃𝑦(𝑦 = 𝐴 ∧ 𝑦 ∈ 𝐵)) |
10 | 1, 9 | nfxfrd 1772 | 1 ⊢ (𝜑 → Ⅎ𝑥 𝐴 ∈ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∃wex 1695 Ⅎwnf 1699 ∈ wcel 1977 Ⅎwnfc 2738 |
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-10 2006 ax-11 2021 ax-12 2034 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-ex 1696 df-nf 1701 df-cleq 2603 df-clel 2606 df-nfc 2740 |
This theorem is referenced by: nfel 2763 nfneld 2891 nfrald 2928 ralcom2 3083 nfreud 3091 nfrmod 3092 nfrmo 3094 nfsbc1d 3420 nfsbcd 3423 sbcrext 3478 sbcrextOLD 3479 nfdisj 4565 nfbrd 4628 nfriotad 6519 nfixp 7813 axrepndlem2 9294 axrepnd 9295 axunnd 9297 axpowndlem2 9299 axpowndlem3 9300 axpowndlem4 9301 axpownd 9302 axregndlem2 9304 axinfndlem1 9306 axinfnd 9307 axacndlem4 9311 axacndlem5 9312 axacnd 9313 nfintd 42218 |
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