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| Mirrors > Home > ILE Home > Th. List > nfunv | GIF version | ||
| Description: The universe is not a function. (Contributed by Raph Levien, 27-Jan-2004.) |
| Ref | Expression |
|---|---|
| nfunv | ⊢ ¬ Fun V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelxp 4797 | . . 3 ⊢ ¬ ∅ ∈ (V × V) | |
| 2 | 0ex 4255 | . . . 4 ⊢ ∅ ∈ V | |
| 3 | df-rel 4776 | . . . . . 6 ⊢ (Rel V ↔ V ⊆ (V × V)) | |
| 4 | 3 | biimpi 120 | . . . . 5 ⊢ (Rel V → V ⊆ (V × V)) |
| 5 | 4 | sseld 3247 | . . . 4 ⊢ (Rel V → (∅ ∈ V → ∅ ∈ (V × V))) |
| 6 | 2, 5 | mpi 15 | . . 3 ⊢ (Rel V → ∅ ∈ (V × V)) |
| 7 | 1, 6 | mto 672 | . 2 ⊢ ¬ Rel V |
| 8 | funrel 5389 | . 2 ⊢ (Fun V → Rel V) | |
| 9 | 7, 8 | mto 672 | 1 ⊢ ¬ Fun V |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∈ wcel 2209 Vcvv 2821 ⊆ wss 3220 ∅c0 3520 × cxp 4767 Rel wrel 4774 Fun wfun 5366 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-opab 4188 df-xp 4775 df-rel 4776 df-fun 5374 |
| This theorem is referenced by: (None) |
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