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Mirrors > Home > ILE Home > Th. List > 0xp | Unicode version |
Description: The cross product with the empty set is empty. Part of Theorem 3.13(ii) of [Monk1] p. 37. (Contributed by NM, 4-Jul-1994.) |
Ref | Expression |
---|---|
0xp |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elxp 4551 | . . 3 | |
2 | noel 3362 | . . . . . . 7 | |
3 | simprl 520 | . . . . . . 7 | |
4 | 2, 3 | mto 651 | . . . . . 6 |
5 | 4 | nex 1476 | . . . . 5 |
6 | 5 | nex 1476 | . . . 4 |
7 | noel 3362 | . . . 4 | |
8 | 6, 7 | 2false 690 | . . 3 |
9 | 1, 8 | bitri 183 | . 2 |
10 | 9 | eqriv 2134 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1331 wex 1468 wcel 1480 c0 3358 cop 3525 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-in1 603 ax-in2 604 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 ax-pr 4126 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-opab 3985 df-xp 4540 |
This theorem is referenced by: res0 4818 xp0 4953 xpeq0r 4956 xpdisj1 4958 xpima1 4980 xpfi 6811 exmidfodomrlemim 7050 hashxp 10565 |
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