Description: Cancellation law for surreal subtraction. (Contributed by Scott Fenton, 4-Feb-2025)
Ref | Expression | ||
---|---|---|---|
Assertion | pncans |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | addscom | ||
2 | 1 | eqcomd | |
3 | addscl | ||
4 | simpr | ||
5 | simpl | ||
6 | 3 4 5 | subaddsd | |
7 | 2 6 | mpbird |