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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 5649 | . . 3 ⊢ (∅ × 𝐴) = ∅ | |
2 | 1 | cnveqi 5745 | . 2 ⊢ ◡(∅ × 𝐴) = ◡∅ |
3 | cnvxp 6014 | . 2 ⊢ ◡(∅ × 𝐴) = (𝐴 × ∅) | |
4 | cnv0 5999 | . 2 ⊢ ◡∅ = ∅ | |
5 | 2, 3, 4 | 3eqtr3i 2852 | 1 ⊢ (𝐴 × ∅) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∅c0 4291 × cxp 5553 ◡ccnv 5554 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-br 5067 df-opab 5129 df-xp 5561 df-rel 5562 df-cnv 5563 |
This theorem is referenced by: xpnz 6016 xpdisj2 6019 difxp1 6022 dmxpss 6028 rnxpid 6030 xpcan 6033 unixp 6133 fconst5 6968 dfac5lem3 9551 djuassen 9604 xpdjuen 9605 alephadd 9999 fpwwe2lem13 10064 0ssc 17107 fuchom 17231 frmdplusg 18019 mulgfval 18226 mulgfvalALT 18227 mulgfvi 18230 ga0 18428 efgval 18843 psrplusg 20161 psrvscafval 20170 opsrle 20256 ply1plusgfvi 20410 txindislem 22241 txhaus 22255 0met 22976 aciunf1 30408 hashxpe 30529 mbfmcst 31517 0rrv 31709 sate0 32662 mexval 32749 mdvval 32751 mpstval 32782 dfpo2 32991 elima4 33019 finxp00 34686 isbnd3 35077 zrdivrng 35246 |
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