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 Gino Giotto, 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 | |