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Mirrors > Home > MPE Home > Th. List > axextnd | Structured version Visualization version Unicode version |
Description: A version of the Axiom of Extensionality with no distinct variable conditions. (Contributed by NM, 14-Aug-2003.) |
Ref | Expression |
---|---|
axextnd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfnae 2318 | . . . . . . . 8 | |
2 | nfnae 2318 | . . . . . . . 8 | |
3 | 1, 2 | nfan 1828 | . . . . . . 7 |
4 | nfcvf 2788 | . . . . . . . . . 10 | |
5 | 4 | adantr 481 | . . . . . . . . 9 |
6 | 5 | nfcrd 2771 | . . . . . . . 8 |
7 | nfcvf 2788 | . . . . . . . . . 10 | |
8 | 7 | adantl 482 | . . . . . . . . 9 |
9 | 8 | nfcrd 2771 | . . . . . . . 8 |
10 | 6, 9 | nfbid 1832 | . . . . . . 7 |
11 | elequ1 1997 | . . . . . . . . 9 | |
12 | elequ1 1997 | . . . . . . . . 9 | |
13 | 11, 12 | bibi12d 335 | . . . . . . . 8 |
14 | 13 | a1i 11 | . . . . . . 7 |
15 | 3, 10, 14 | cbvald 2277 | . . . . . 6 |
16 | axext3 2604 | . . . . . 6 | |
17 | 15, 16 | syl6bir 244 | . . . . 5 |
18 | 19.8a 2052 | . . . . 5 | |
19 | 17, 18 | syl6 35 | . . . 4 |
20 | 19 | ex 450 | . . 3 |
21 | ax6e 2250 | . . . . 5 | |
22 | ax7 1943 | . . . . . 6 | |
23 | 22 | aleximi 1759 | . . . . 5 |
24 | 21, 23 | mpi 20 | . . . 4 |
25 | 24 | a1d 25 | . . 3 |
26 | ax6e 2250 | . . . . 5 | |
27 | ax7 1943 | . . . . . . 7 | |
28 | equcomi 1944 | . . . . . . 7 | |
29 | 27, 28 | syl6 35 | . . . . . 6 |
30 | 29 | aleximi 1759 | . . . . 5 |
31 | 26, 30 | mpi 20 | . . . 4 |
32 | 31 | a1d 25 | . . 3 |
33 | 20, 25, 32 | pm2.61ii 177 | . 2 |
34 | 33 | 19.35ri 1807 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wa 384 wal 1481 wex 1704 wnfc 2751 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-cleq 2615 df-clel 2618 df-nfc 2753 |
This theorem is referenced by: zfcndext 9435 axextprim 31578 axextdfeq 31703 axextndbi 31710 |
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