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Related theorems GIF version |
| Description: The universe is not a function. (Contributed by Raph Levien, 27-Jan-04.) |
| Ref | Expression |
|---|---|
| nfunv | ⊢ ¬ Fun V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelxp 2475 | . . 3 ⊢ ¬ ∅ ∈ (V × V) | |
| 2 | 0ex 1745 | . . . 4 ⊢ ∅ ∈ V | |
| 3 | df-rel 2425 | . . . . . 6 ⊢ (Rel V ↔ V ⊆ (V × V)) | |
| 4 | 3 | biimp 133 | . . . . 5 ⊢ (Rel V → V ⊆ (V × V)) |
| 5 | 4 | sseld 1506 | . . . 4 ⊢ (Rel V → (∅ ∈ V → ∅ ∈ (V × V))) |
| 6 | 2, 5 | mpi 44 | . . 3 ⊢ (Rel V → ∅ ∈ (V × V)) |
| 7 | 1, 6 | mto 93 | . 2 ⊢ ¬ Rel V |
| 8 | funrel 2681 | . 2 ⊢ (Fun V → Rel V) | |
| 9 | 7, 8 | mto 93 | 1 ⊢ ¬ Fun V |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 ∈ wcel 1092 Vcvv 1348 ⊆ wss 1487 ∅c0 1707 × cxp 2408 Rel wrel 2415 Fun wfun 2416 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-opab 2098 df-xp 2424 df-rel 2425 df-fun 2432 |