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Mirrors > Home > MPE Home > Th. List > xp0 | Structured version Visualization version GIF version |
Description: The Cartesian 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 5613 | . . 3 ⊢ (∅ × 𝐴) = ∅ | |
2 | 1 | cnveqi 5709 | . 2 ⊢ ◡(∅ × 𝐴) = ◡∅ |
3 | cnvxp 5981 | . 2 ⊢ ◡(∅ × 𝐴) = (𝐴 × ∅) | |
4 | cnv0 5966 | . 2 ⊢ ◡∅ = ∅ | |
5 | 2, 3, 4 | 3eqtr3i 2829 | 1 ⊢ (𝐴 × ∅) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ∅c0 4243 × cxp 5517 ◡ccnv 5518 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-br 5031 df-opab 5093 df-xp 5525 df-rel 5526 df-cnv 5527 |
This theorem is referenced by: xpnz 5983 xpdisj2 5986 difxp1 5989 dmxpss 5995 rnxpid 5997 xpcan 6000 unixp 6101 fconst5 6945 dfac5lem3 9536 djuassen 9589 xpdjuen 9590 alephadd 9988 fpwwe2lem13 10053 0ssc 17099 fuchom 17223 frmdplusg 18011 mulgfval 18218 mulgfvalALT 18219 mulgfvi 18222 ga0 18420 efgval 18835 psrplusg 20619 psrvscafval 20628 opsrle 20715 ply1plusgfvi 20871 txindislem 22238 txhaus 22252 0met 22973 2ndimaxp 30409 aciunf1 30426 hashxpe 30555 mbfmcst 31627 0rrv 31819 sate0 32775 mexval 32862 mdvval 32864 mpstval 32895 dfpo2 33104 elima4 33132 finxp00 34819 isbnd3 35222 zrdivrng 35391 |
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