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| Mirrors > Home > ILE Home > Th. List > xpex | GIF version | ||
| Description: The cross product of two sets is a set. Proposition 6.2 of [TakeutiZaring] p. 23. (Contributed by NM, 14-Aug-1994.) |
| Ref | Expression |
|---|---|
| xpex.1 | ⊢ 𝐴 ∈ V |
| xpex.2 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| xpex | ⊢ (𝐴 × 𝐵) ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xpex.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | xpex.2 | . 2 ⊢ 𝐵 ∈ V | |
| 3 | xpexg 4838 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 4 | 1, 2, 3 | mp2an 426 | 1 ⊢ (𝐴 × 𝐵) ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 Vcvv 2800 × cxp 4721 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-rex 2514 df-v 2802 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-opab 4149 df-xp 4729 |
| This theorem is referenced by: oprabex 6285 oprabex3 6286 mpoexw 6373 fnpm 6820 mapsnf1o2 6860 xpsnen 7000 endisj 7003 xpcomen 7006 xpassen 7009 xpmapenlem 7030 0ct 7300 exmidomni 7335 exmidfodomrlemim 7405 2omotaplemst 7470 enqex 7573 nqex 7576 enq0ex 7652 nq0ex 7653 npex 7686 enrex 7950 addvalex 8057 axcnex 8072 addex 9879 mulex 9880 ixxex 10127 fxnn0nninf 10694 inftonninf 10697 shftfval 11375 nninfct 12605 qnumval 12750 qdenval 12751 qnnen 13045 prdsex 13345 metuex 14562 cnfldstr 14565 cnfldle 14574 znval 14643 znle 14644 znbaslemnn 14646 fnpsr 14674 txuni2 14973 txbas 14975 eltx 14976 txcnp 14988 txcnmpt 14990 txrest 14993 txlm 14996 reldvg 15396 |
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