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Mirrors > Home > MPE Home > Th. List > unex | Structured version Visualization version Unicode version |
Description: The union of two sets is a set. Corollary 5.8 of [TakeutiZaring] p. 16. (Contributed by NM, 1-Jul-1994.) |
Ref | Expression |
---|---|
unex.1 | |
unex.2 |
Ref | Expression |
---|---|
unex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unex.1 | . . 3 | |
2 | unex.2 | . . 3 | |
3 | 1, 2 | unipr 4449 | . 2 |
4 | prex 4909 | . . 3 | |
5 | 4 | uniex 6953 | . 2 |
6 | 3, 5 | eqeltrri 2698 | 1 |
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