Description: Deduction adding union to the right in a class equality. (Contributed by NM, 29-Mar-1998)
Ref | Expression | ||
---|---|---|---|
Hypothesis | uneq1d.1 | |
|
Assertion | uneq1d | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uneq1d.1 | |
|
2 | uneq1 | |
|
3 | 1 2 | syl | |