Description: Rearrangement of 4 terms in a subtraction. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypotheses | negidd.1 | |
|
pncand.2 | |
||
subaddd.3 | |
||
addsub4d.4 | |
||
Assertion | sub4d | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negidd.1 | |
|
2 | pncand.2 | |
|
3 | subaddd.3 | |
|
4 | addsub4d.4 | |
|
5 | sub4 | |
|
6 | 1 2 3 4 5 | syl22anc | |