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| Mirrors > Home > MPE Home > Th. List > uneq12d | Structured version Visualization version Unicode version | ||
| Description: Equality deduction for the union of two classes. (Contributed by NM, 29-Sep-2004.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
| Ref | Expression |
|---|---|
| uneq1d.1 |
|
| uneq12d.2 |
|
| Ref | Expression |
|---|---|
| uneq12d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uneq1d.1 |
. 2
| |
| 2 | uneq12d.2 |
. 2
| |
| 3 | uneq12 3762 |
. 2
| |
| 4 | 1, 2, 3 | syl2anc 693 |
1
|
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