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Description: The binary relation over a tail cross when the second argument is not an ordered pair. (Contributed by Scott Fenton, 14-Apr-2014) (Revised by Mario Carneiro, 3-May-2015)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | brtxp2.1 | ||
| Assertion | brtxp2 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brtxp2.1 | ||
| 2 | txpss3v | ||
| 3 | 2 | brel | |
| 4 | 3 | simprd | |
| 5 | elvv | ||
| 6 | 4 5 | sylib | |
| 7 | 6 | pm4.71ri | |
| 8 | 19.41vv | ||
| 9 | 7 8 | bitr4i | |
| 10 | breq2 | ||
| 11 | 10 | pm5.32i | |
| 12 | 11 | 2exbii | |
| 13 | vex | ||
| 14 | vex | ||
| 15 | 1 13 14 | brtxp | |
| 16 | 15 | anbi2i | |
| 17 | 3anass | ||
| 18 | 16 17 | bitr4i | |
| 19 | 18 | 2exbii | |
| 20 | 9 12 19 | 3bitri |