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Mirrors > Home > ILE Home > Th. List > unixpss | Unicode version |
Description: The double class union of a cross product is included in the union of its arguments. (Contributed by NM, 16-Sep-2006.) |
Ref | Expression |
---|---|
unixpss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xpsspw 4646 | . . . . 5 | |
2 | 1 | unissi 3754 | . . . 4 |
3 | unipw 4134 | . . . 4 | |
4 | 2, 3 | sseqtri 3126 | . . 3 |
5 | 4 | unissi 3754 | . 2 |
6 | unipw 4134 | . 2 | |
7 | 5, 6 | sseqtri 3126 | 1 |
Colors of variables: wff set class |
Syntax hints: cun 3064 wss 3066 cpw 3505 cuni 3731 cxp 4532 |
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-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-opab 3985 df-xp 4540 |
This theorem is referenced by: relfld 5062 |
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