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Mirrors > Home > ILE Home > Th. List > iunpwss | Unicode version |
Description: Inclusion of an indexed union of a power class in the power class of the union of its index. Part of Exercise 24(b) of [Enderton] p. 33. (Contributed by NM, 25-Nov-2003.) |
Ref | Expression |
---|---|
iunpwss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssiun 3891 | . . 3 | |
2 | eliun 3853 | . . . 4 | |
3 | vex 2715 | . . . . . 6 | |
4 | 3 | elpw 3549 | . . . . 5 |
5 | 4 | rexbii 2464 | . . . 4 |
6 | 2, 5 | bitri 183 | . . 3 |
7 | 3 | elpw 3549 | . . . 4 |
8 | uniiun 3902 | . . . . 5 | |
9 | 8 | sseq2i 3155 | . . . 4 |
10 | 7, 9 | bitri 183 | . . 3 |
11 | 1, 6, 10 | 3imtr4i 200 | . 2 |
12 | 11 | ssriv 3132 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 2128 wrex 2436 wss 3102 cpw 3543 cuni 3772 ciun 3849 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2139 |
This theorem depends on definitions: df-bi 116 df-tru 1338 df-nf 1441 df-sb 1743 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ral 2440 df-rex 2441 df-v 2714 df-in 3108 df-ss 3115 df-pw 3545 df-uni 3773 df-iun 3851 |
This theorem is referenced by: (None) |
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