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Mirrors > Home > MPE Home > Th. List > eujust | Structured version Visualization version Unicode version |
Description: A soundness justification theorem for df-eu 2474, showing that the definition is equivalent to itself with its dummy variable renamed. Note that and needn't be distinct variables. See eujustALT 2473 for a proof that provides an example of how it can be achieved through the use of dvelim 2337. (Contributed by NM, 11-Mar-2010.) (Proof shortened by Andrew Salmon, 9-Jul-2011.) |
Ref | Expression |
---|---|
eujust |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equequ2 1953 | . . . . 5 | |
2 | 1 | bibi2d 332 | . . . 4 |
3 | 2 | albidv 1849 | . . 3 |
4 | 3 | cbvexv 2275 | . 2 |
5 | equequ2 1953 | . . . . 5 | |
6 | 5 | bibi2d 332 | . . . 4 |
7 | 6 | albidv 1849 | . . 3 |
8 | 7 | cbvexv 2275 | . 2 |
9 | 4, 8 | bitri 264 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wb 196 wal 1481 wex 1704 |
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-11 2034 ax-12 2047 ax-13 2246 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 |
This theorem is referenced by: (None) |
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