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| Description: Membership in a cross product. |
| Ref | Expression |
|---|---|
| elxp |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-xp 3190 |
. . 3
| |
| 2 | 1 | eleq2i 1541 |
. 2
|
| 3 | elopab 2817 |
. 2
| |
| 4 | 2, 3 | bitr 173 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elxp2 3209 hbxp 3210 opelxp1 3211 opelxp 3220 ralxp 3224 elxp3 3230 elvv 3234 xpss 3236 xp0r 3245 0nelxp 3246 elxp4 3459 elxp5 3460 fnoprval 4023 2ndconst 4103 xpsnen 4441 xpcomen 4445 xpassen 4447 aceq5lem1 4745 aceq5lem4 4748 elreal 5262 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-opab 2672 df-xp 3190 |