Description: Rearrangement of four terms in a surreal sum. (Contributed by Scott Fenton, 5-Feb-2025)
Ref | Expression | ||
---|---|---|---|
Hypotheses | adds4d.1 | ||
adds4d.2 | |||
adds4d.3 | |||
adds4d.4 | |||
Assertion | adds42d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | adds4d.1 | ||
2 | adds4d.2 | ||
3 | adds4d.3 | ||
4 | adds4d.4 | ||
5 | 1 2 3 4 | adds4d | |
6 | 2 4 | addscomd | |
7 | 6 | oveq2d | |
8 | 5 7 | eqtrd |