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Mirrors > Home > MPE Home > Th. List > undif | Structured version Visualization version Unicode version |
Description: Union of complementary parts into whole. (Contributed by NM, 22-Mar-1998.) |
Ref | Expression |
---|---|
undif |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssequn1 3783 | . 2 | |
2 | undif2 4044 | . . 3 | |
3 | 2 | eqeq1i 2627 | . 2 |
4 | 1, 3 | bitr4i 267 | 1 |
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