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| Mirrors > Home > NFE Home > Th. List > df-co | Unicode version | ||
| Description: Define the composition of two classes. (Contributed by SF, 5-Jan-2015.) |
| Ref | Expression |
|---|---|
| df-co |
                ![](wedge.gif "/\"){kind=small}  |
,,, ,,,| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cA |
. . 3
 | |
| 2 | cB |
. . 3
| |
| 3 | 1, 2 | ccom 4721 |
. 2
|
| 4 | vx |
. . . . . . 7
 | |
| 5 | 4 | cv 1641 |
. . . . . 6
|
| 6 | vz |
. . . . . . 7
| |
| 7 | 6 | cv 1641 |
. . . . . 6
|
| 8 | 5, 7, 2 | wbr 4639 |
. . . . 5
 |
| 9 | vy |
. . . . . . 7
| |
| 10 | 9 | cv 1641 |
. . . . . 6
|
| 11 | 7, 10, 1 | wbr 4639 |
. . . . 5
|
| 12 | 8, 11 | wa 358 |
. . . 4
|
| 13 | 12, 6 | wex 1541 |
. . 3
|
| 14 | 13, 4, 9 | copab 4622 |
. 2
|
| 15 | 3, 14 | wceq 1642 |
1
|
| Colors of variables: wff setvar class |
| This definition is referenced by: dfco1 4748 coss1 4872 coss2 4873 nfco 4882 brco 4883 cnvco 4894 coundi 5082 coundir 5083 cores 5084 df2nd2 5111 funco 5142 composeex 5820 |
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