| 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 2778 |
. . 3
| |
| 2 | 1 | pri2 2449 |
. 2
|
| 3 | df-op 2414 |
. 2
| |
| 4 | 2, 3 | eleqtrr 1546 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: uniopel 2806 opeluu 2876 elvvuni 3226 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2700 ax-pow 2739 ax-pr 2776 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 980 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1586 df-v 1810 df-dif 2047 df-un 2048 df-in 2049 df-ss 2051 df-nul 2279 df-pw 2400 df-sn 2410 df-pr 2411 df-op 2414 |