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| Description: The universe is not a function. (Contributed by Raph Levien, 27-Jan-2004.) |
| Ref | Expression |
|---|---|
| nfunv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelxp 3240 |
. . 3
| |
| 2 | 0ex 2711 |
. . . 4
| |
| 3 | df-rel 3185 |
. . . . . 6
| |
| 4 | 3 | biimp 151 |
. . . . 5
|
| 5 | 4 | sseld 2067 |
. . . 4
|
| 6 | 2, 5 | mpi 44 |
. . 3
|
| 7 | 1, 6 | mto 106 |
. 2
|
| 8 | funrel 3533 |
. 2
| |
| 9 | 7, 8 | mto 106 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-nul 2710 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-opab 2667 df-xp 3184 df-rel 3185 df-fun 3192 |