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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 |
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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