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| Mirrors > Home > MPE Home > Th. List > 0elixp | Structured version Visualization version GIF version | ||
| Description: Membership of the empty set in an infinite Cartesian product. (Contributed by Steve Rodriguez, 29-Sep-2006.) |
| Ref | Expression |
|---|---|
| 0elixp | ⊢ ∅ ∈ X𝑥 ∈ ∅ 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 5264 | . . 3 ⊢ ∅ ∈ V | |
| 2 | 1 | snid 4623 | . 2 ⊢ ∅ ∈ {∅} |
| 3 | ixp0x 8933 | . 2 ⊢ X𝑥 ∈ ∅ 𝐴 = {∅} | |
| 4 | 2, 3 | eleqtrri 2859 | 1 ⊢ ∅ ∈ X𝑥 ∈ ∅ 𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 ∅c0 4279 {csn 4584 Xcixp 8904 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-fun 6535 df-fn 6536 df-ixp 8905 |
| This theorem is used by: (None) |
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