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Mirrors > Home > ILE Home > Th. List > xp0 | GIF version |
Description: The cross product with the empty set is empty. Part of Theorem 3.13(ii) of [Monk1] p. 37. (Contributed by NM, 12-Apr-2004.) |
Ref | Expression |
---|---|
xp0 | ⊢ (𝐴 × ∅) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0xp 4739 | . . 3 ⊢ (∅ × 𝐴) = ∅ | |
2 | 1 | cnveqi 4837 | . 2 ⊢ ◡(∅ × 𝐴) = ◡∅ |
3 | cnvxp 5084 | . 2 ⊢ ◡(∅ × 𝐴) = (𝐴 × ∅) | |
4 | cnv0 5069 | . 2 ⊢ ◡∅ = ∅ | |
5 | 2, 3, 4 | 3eqtr3i 2222 | 1 ⊢ (𝐴 × ∅) = ∅ |
Colors of variables: wff set class |
Syntax hints: = wceq 1364 ∅c0 3446 × cxp 4657 ◡ccnv 4658 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pow 4203 ax-pr 4238 |
This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ral 2477 df-rex 2478 df-v 2762 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-nul 3447 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-br 4030 df-opab 4091 df-xp 4665 df-rel 4666 df-cnv 4667 |
This theorem is referenced by: xpeq0r 5088 xpdisj2 5091 djuassen 7277 xpdjuen 7278 0met 14552 |
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