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Mirrors > Home > MPE Home > Th. List > snexALT | Structured version Visualization version GIF version |
Description: Alternate proof of snex 4908 using Power Set (ax-pow 4843) instead of Pairing (ax-pr 4906). Unlike in the proof of zfpair 4904, Replacement (ax-rep 4771) is not needed. (Contributed by NM, 7-Aug-1994.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
snexALT | ⊢ {𝐴} ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snsspw 4375 | . . 3 ⊢ {𝐴} ⊆ 𝒫 𝐴 | |
2 | ssexg 4804 | . . 3 ⊢ (({𝐴} ⊆ 𝒫 𝐴 ∧ 𝒫 𝐴 ∈ V) → {𝐴} ∈ V) | |
3 | 1, 2 | mpan 706 | . 2 ⊢ (𝒫 𝐴 ∈ V → {𝐴} ∈ V) |
4 | pwexg 4850 | . . . 4 ⊢ (𝐴 ∈ V → 𝒫 𝐴 ∈ V) | |
5 | 4 | con3i 150 | . . 3 ⊢ (¬ 𝒫 𝐴 ∈ V → ¬ 𝐴 ∈ V) |
6 | snprc 4253 | . . . . 5 ⊢ (¬ 𝐴 ∈ V ↔ {𝐴} = ∅) | |
7 | 6 | biimpi 206 | . . . 4 ⊢ (¬ 𝐴 ∈ V → {𝐴} = ∅) |
8 | 0ex 4790 | . . . 4 ⊢ ∅ ∈ V | |
9 | 7, 8 | syl6eqel 2709 | . . 3 ⊢ (¬ 𝐴 ∈ V → {𝐴} ∈ V) |
10 | 5, 9 | syl 17 | . 2 ⊢ (¬ 𝒫 𝐴 ∈ V → {𝐴} ∈ V) |
11 | 3, 10 | pm2.61i 176 | 1 ⊢ {𝐴} ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1483 ∈ wcel 1990 Vcvv 3200 ⊆ wss 3574 ∅c0 3915 𝒫 cpw 4158 {csn 4177 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-dif 3577 df-in 3581 df-ss 3588 df-nul 3916 df-pw 4160 df-sn 4178 |
This theorem is referenced by: p0exALT 4854 |
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