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Description: Deduction version of nfriota with a disjoint variable condition, which contrary to nfriotad does not require ax-13 . (Contributed by NM, 18-Feb-2013) Avoid ax-13 . (Revised by GG, 26-Jan-2024)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | nfriotadw.1 | ||
| nfriotadw.2 | |||
| nfriotadw.3 | |||
| Assertion | nfriotadw |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfriotadw.1 | ||
| 2 | nfriotadw.2 | ||
| 3 | nfriotadw.3 | ||
| 4 | df-riota | ||
| 5 | nfnaew | ||
| 6 | 1 5 | nfan | |
| 7 | nfcvd | ||
| 8 | 7 | adantl | |
| 9 | 3 | adantr | |
| 10 | 8 9 | nfeld | |
| 11 | 2 | adantr | |
| 12 | 10 11 | nfand | |
| 13 | 6 12 | nfiotadw | |
| 14 | 13 | ex | |
| 15 | nfiota1 | ||
| 16 | biidd | ||
| 17 | 16 | drnf1v | |
| 18 | 17 | albidv | |
| 19 | df-nfc | ||
| 20 | df-nfc | ||
| 21 | 18 19 20 | 3bitr4g | |
| 22 | 15 21 | mpbiri | |
| 23 | 14 22 | pm2.61d2 | |
| 24 | 4 23 | nfcxfrd |