Description: Relationship between subtraction and negative. (Contributed by Paul Chapman, 8-Oct-2007)
Ref | Expression | ||
---|---|---|---|
Assertion | neg2sub | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negcl | |
|
2 | subneg | |
|
3 | 1 2 | sylan | |
4 | negsubdi | |
|
5 | negsubdi2 | |
|
6 | 3 4 5 | 3eqtr2d | |