Description: The class of all limit ordinals is a subclass of the class of all ordinals. (Contributed by Scott Fenton, 11-Apr-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | limitssson |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-limits | ||
2 | difss | ||
3 | inss1 | ||
4 | 2 3 | sstri | |
5 | 1 4 | eqsstri |