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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 5272 | . . 3 ⊢ ∅ ∈ V | |
| 2 | 1 | snid 4630 | . 2 ⊢ ∅ ∈ {∅} |
| 3 | ixp0x 8926 | . 2 ⊢ X𝑥 ∈ ∅ 𝐴 = {∅} | |
| 4 | 2, 3 | eleqtrri 2864 | 1 ⊢ ∅ ∈ X𝑥 ∈ ∅ 𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 ∅c0 4286 {csn 4591 Xcixp 8897 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pr 5406 |
| 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 2569 df-clab 2744 df-cleq 2757 df-clel 2840 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-br 5112 df-opab 5176 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-fun 6542 df-fn 6543 df-ixp 8898 |
| This theorem is used by: (None) |
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