Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > elssuni | Structured version Visualization version Unicode version |
Description: An element of a class is a subclass of its union. Theorem 8.6 of [Quine] p. 54. Also the basis for Proposition 7.20 of [TakeutiZaring] p. 40. (Contributed by NM, 6-Jun-1994.) |
Ref | Expression |
---|---|
elssuni |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3624 | . 2 | |
2 | ssuni 4459 | . 2 | |
3 | 1, 2 | mpan 706 | 1 |
Copyright terms: Public domain | W3C validator |