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Mirrors > Home > MPE Home > Th. List > eleq2dALT | Structured version Visualization version Unicode version |
Description: Alternate proof of eleq2d 2687, shorter at the expense of using more axioms. (Contributed by NM, 27-Dec-1993.) (Revised by Wolf Lammen, 20-Nov-2019.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
eleq1d.1 |
Ref | Expression |
---|---|
eleq2dALT |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1d.1 | . . . . . 6 | |
2 | dfcleq 2616 | . . . . . 6 | |
3 | 1, 2 | sylib 208 | . . . . 5 |
4 | 3 | 19.21bi 2059 | . . . 4 |
5 | 4 | anbi2d 740 | . . 3 |
6 | 5 | exbidv 1850 | . 2 |
7 | df-clel 2618 | . 2 | |
8 | df-clel 2618 | . 2 | |
9 | 6, 7, 8 | 3bitr4g 303 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 wal 1481 wceq 1483 wex 1704 wcel 1990 |
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-9 1999 ax-12 2047 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-cleq 2615 df-clel 2618 |
This theorem is referenced by: (None) |
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