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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 8234 | . 2 ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) = 𝒫 ∪ 𝑆) | |
2 | pwne0 5339 | . . 3 ⊢ 𝒫 ∪ 𝑆 ≠ ∅ | |
3 | 2 | a1i 11 | . 2 ⊢ (𝑆 ∈ 𝑉 → 𝒫 ∪ 𝑆 ≠ ∅) |
4 | 1, 3 | eqnetrd 3007 | 1 ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) ≠ ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2106 ≠ wne 2939 ∅c0 4309 𝒫 cpw 4587 ∪ cuni 4892 ‘cfv 6523 Undefcund 8230 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2702 ax-sep 5283 ax-nul 5290 ax-pow 5347 ax-pr 5411 ax-un 7699 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-ral 3061 df-rex 3070 df-rab 3426 df-v 3468 df-dif 3938 df-un 3940 df-in 3942 df-ss 3952 df-nul 4310 df-if 4514 df-pw 4589 df-sn 4614 df-pr 4616 df-op 4620 df-uni 4893 df-br 5133 df-opab 5195 df-mpt 5216 df-id 5558 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-iota 6475 df-fun 6525 df-fv 6531 df-undef 8231 |
This theorem is referenced by: (None) |
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