Description: Substitution property for (| - ,, - |) . (Contributed by BJ, 6-Oct-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-2upleq | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-1upleq | |
|
2 | bj-xtageq | |
|
3 | uneq12 | |
|
4 | 3 | ex | |
5 | 1 2 4 | syl2im | |
6 | df-bj-2upl | |
|
7 | df-bj-2upl | |
|
8 | 6 7 | eqeq12i | |
9 | 5 8 | syl6ibr | |