| Metamath Proof Explorer |
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Related theorems Unicode version |
| Description: One of the two elements of an ordered pair. |
| Ref | Expression |
|---|---|
| opi2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prex 2857 |
. . 3
| |
| 2 | 1 | prid2 2514 |
. 2
|
| 3 | df-op 2474 |
. 2
| |
| 4 | 2, 3 | eleqtrri 1590 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: uniopel 2886 opeluu 3103 elvvuni 3315 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-10 1002 ax-11 1003 ax-12 1004 ax-13 1005 ax-14 1006 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 ax-sep 2777 ax-pow 2818 ax-pr 2855 |
| This theorem depends on definitions: df-bi 145 df-or 222 df-an 223 df-ex 1017 df-sb 1209 df-eu 1421 df-mo 1422 df-clab 1506 df-cleq 1511 df-clel 1514 df-ne 1630 df-v 1858 df-dif 2101 df-un 2102 df-in 2103 df-ss 2105 df-nul 2333 df-pw 2459 df-sn 2470 df-pr 2471 df-op 2474 |