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| Description: Membership in a cross product. |
| Ref | Expression |
|---|---|
| elxp |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-xp 3174 |
. . 3
| |
| 2 | 1 | eleq2i 1530 |
. 2
|
| 3 | elopab 2800 |
. 2
| |
| 4 | 2, 3 | bitr 173 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elxp2 3193 hbxp 3194 opelxp1 3195 opelxp 3204 ralxp 3208 elxp3 3214 elvv 3218 xpss 3220 xp0r 3229 0nelxp 3230 elxp4 3439 elxp5 3440 fnoprval 4002 2ndconst 4081 xpsnen 4415 xpcomen 4419 xpassen 4421 aceq5lem1 4707 aceq5lem4 4710 elreal 5222 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-opab 2657 df-xp 3174 |