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| Mirrors > Home > ILE Home > Th. List > addcomnqg | Unicode version | ||
| Description: Addition of positive fractions is commutative. (Contributed by Jim Kingdon, 15-Sep-2019.) |
| Ref | Expression |
|---|---|
| addcomnqg |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-nqqs 6538 |
. 2
| |
| 2 | addpipqqs 6560 |
. 2
| |
| 3 | addpipqqs 6560 |
. 2
| |
| 4 | mulcompig 6521 |
. . . . 5
| |
| 5 | mulcompig 6521 |
. . . . 5
| |
| 6 | 4, 5 | oveqan12d 5551 |
. . . 4
|
| 7 | 6 | an42s 553 |
. . 3
|
| 8 | mulclpi 6518 |
. . . . . 6
| |
| 9 | 8 | ancoms 264 |
. . . . 5
|
| 10 | 9 | ad2ant2rl 494 |
. . . 4
|
| 11 | mulclpi 6518 |
. . . . . 6
| |
| 12 | 11 | ancoms 264 |
. . . . 5
|
| 13 | 12 | ad2ant2lr 493 |
. . . 4
|
| 14 | addcompig 6519 |
. . . 4
| |
| 15 | 10, 13, 14 | syl2anc 403 |
. . 3
|
| 16 | 7, 15 | eqtrd 2113 |
. 2
|
| 17 | mulcompig 6521 |
. . 3
| |
| 18 | 17 | ad2ant2l 491 |
. 2
|
| 19 | 1, 2, 3, 16, 18 | ecovicom 6237 |
1
|
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