Description: Equality of two extended numbers with -e in front of them. (Contributed by Glauco Siliprandi, 2-Jan-2022)
Ref | Expression | ||
---|---|---|---|
Hypothesis | xnegeqd.1 | |- ( ph -> A = B ) |
|
Assertion | xnegeqd | |- ( ph -> -e A = -e B ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xnegeqd.1 | |- ( ph -> A = B ) |
|
2 | xnegeq | |- ( A = B -> -e A = -e B ) |
|
3 | 1 2 | syl | |- ( ph -> -e A = -e B ) |