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| Description: Alternate proof of Russell's Paradox ru 1945, simplified using (indirectly) the Axiom of Regularity ax-reg 4608. (Contributed by Alan Sare, 4-Oct-2008.) |
| Ref | Expression |
|---|---|
| ruALT |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nvelv 2728 |
. . 3
| |
| 2 | df-nel 1595 |
. . 3
| |
| 3 | 1, 2 | mpbir 190 |
. 2
|
| 4 | ruv 4616 |
. . 3
| |
| 5 | neleq1 1649 |
. . 3
| |
| 6 | 4, 5 | ax-mp 7 |
. 2
|
| 7 | 3, 6 | mpbir 190 |
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-7 966 ax-gen 967 ax-8 968 ax-10 970 ax-11 971 ax-12 972 ax-13 973 ax-14 974 ax-17 975 ax-4 977 ax-5o 979 ax-6o 982 ax-9o 1127 ax-10o 1144 ax-16 1214 ax-11o 1222 ax-ext 1464 ax-sep 2718 ax-pow 2758 ax-reg 4608 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 985 df-sb 1176 df-eu 1386 df-mo 1387 df-clab 1470 df-cleq 1475 df-clel 1478 df-ne 1594 df-nel 1595 df-ral 1656 df-rex 1657 df-v 1819 df-dif 2060 df-un 2061 df-in 2062 df-ss 2064 df-nul 2292 df-pw 2414 df-sn 2424 df-pr 2425 |