Description: The number 8 is real. (Contributed by NM, 27-May-1999)
Ref | Expression | ||
---|---|---|---|
Assertion | 8re | |- 8 e. RR |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-8 | |- 8 = ( 7 + 1 ) |
|
2 | 7re | |- 7 e. RR |
|
3 | 1re | |- 1 e. RR |
|
4 | 2 3 | readdcli | |- ( 7 + 1 ) e. RR |
5 | 1 4 | eqeltri | |- 8 e. RR |