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| Mirrors > Home > ILE Home > Th. List > prcom | GIF version | ||
| Description: Commutative law for unordered pairs. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| prcom | ⊢ {𝐴, 𝐵} = {𝐵, 𝐴} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uncom 3353 | . 2 ⊢ ({𝐴} ∪ {𝐵}) = ({𝐵} ∪ {𝐴}) | |
| 2 | df-pr 3680 | . 2 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
| 3 | df-pr 3680 | . 2 ⊢ {𝐵, 𝐴} = ({𝐵} ∪ {𝐴}) | |
| 4 | 1, 2, 3 | 3eqtr4i 2262 | 1 ⊢ {𝐴, 𝐵} = {𝐵, 𝐴} |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ∪ cun 3199 {csn 3673 {cpr 3674 |
| 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-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-un 3205 df-pr 3680 |
| This theorem is referenced by: preq2 3753 tpcoma 3769 tpidm23 3776 prid2g 3780 prid2 3782 prprc2 3785 difprsn2 3818 ssprsseq 3840 preqr2g 3855 preqr2 3857 preq12b 3858 elpr2elpr 3864 fvpr2 5867 fvpr2g 5869 pr2cv2 7444 en2other2 7450 maxcom 11826 mincom 11852 xrmax2sup 11877 xrmaxltsup 11881 xrmaxadd 11884 xrbdtri 11899 lspprid2 14491 qtopbasss 15315 uhgr2edg 16130 usgredg4 16139 usgredg2vlem1 16146 usgredg2vlem2 16147 1hegrvtxdg1rfi 16234 vdegp1cid 16240 clwwlkn2 16345 clwwlknonex2 16363 |
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