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| Mirrors > Home > MPE Home > Th. List > undefne0 | Structured version Visualization version GIF version | ||
| Description: The undefined value generated from a set is not empty. (Contributed by NM, 3-Sep-2018.) |
| Ref | Expression |
|---|---|
| undefne0 | ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | undefval 8219 | . 2 ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) = 𝒫 ∪ 𝑆) | |
| 2 | pwne0 5294 | . . 3 ⊢ 𝒫 ∪ 𝑆 ≠ ∅ | |
| 3 | 2 | a1i 11 | . 2 ⊢ (𝑆 ∈ 𝑉 → 𝒫 ∪ 𝑆 ≠ ∅) |
| 4 | 1, 3 | eqnetrd 3000 | 1 ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 ∅c0 4274 𝒫 cpw 4542 ∪ cuni 4851 ‘cfv 6492 Undefcund 8215 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-iota 6448 df-fun 6494 df-fv 6500 df-undef 8216 |
| This theorem is referenced by: (None) |
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