Description: Rearrangement of 4 terms in a sum. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypotheses | addd.1 | |
|
addd.2 | |
||
addd.3 | |
||
add4d.4 | |
||
Assertion | add42d | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | addd.1 | |
|
2 | addd.2 | |
|
3 | addd.3 | |
|
4 | add4d.4 | |
|
5 | add42 | |
|
6 | 1 2 3 4 5 | syl22anc | |