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Mirrors > Home > ILE Home > Th. List > uniexb | Unicode version |
Description: The Axiom of Union and its converse. A class is a set iff its union is a set. (Contributed by NM, 11-Nov-2003.) |
Ref | Expression |
---|---|
uniexb |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uniexg 4356 | . 2 | |
2 | pwuni 4111 | . . 3 | |
3 | pwexg 4099 | . . 3 | |
4 | ssexg 4062 | . . 3 | |
5 | 2, 3, 4 | sylancr 410 | . 2 |
6 | 1, 5 | impbii 125 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wcel 1480 cvv 2681 wss 3066 cpw 3505 cuni 3731 |
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 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-rex 2420 df-v 2683 df-in 3072 df-ss 3079 df-pw 3507 df-uni 3732 |
This theorem is referenced by: pwexb 4390 elpwpwel 4391 tfrlemibex 6219 tfr1onlembex 6235 tfrcllembex 6248 ixpexgg 6609 tgss2 12237 txbasex 12415 |
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