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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 4863 | . 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 2203 Vcvv 2812 × cxp 4746 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-pr 4321 ax-un 4553 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-rex 2526 df-v 2814 df-un 3214 df-in 3216 df-ss 3223 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-opab 4171 df-xp 4754 |
| This theorem is referenced by: oprabex 6320 oprabex3 6321 mpoexw 6408 fnpm 6889 mapsnf1o2 6930 xpsnen 7071 endisj 7074 xpcomen 7077 xpassen 7080 xpmapenlem 7101 0ct 7397 exmidomni 7432 exmidfodomrlemim 7503 2omotaplemst 7568 enqex 7671 nqex 7674 enq0ex 7750 nq0ex 7751 npex 7784 enrex 8048 addvalex 8155 axcnex 8170 addex 9980 mulex 9981 ixxex 10228 fxnn0nninf 10797 inftonninf 10800 shftfval 11499 nninfct 12730 qnumval 12875 qdenval 12876 qnnen 13171 prdsex 13471 metuex 14690 cnfldstr 14693 cnfldle 14702 znval 14771 znle 14772 znbaslemnn 14774 fnpsr 14802 txuni2 15108 txbas 15110 eltx 15111 txcnp 15123 txcnmpt 15125 txrest 15128 txlm 15131 reldvg 15531 pellexlem3 15834 |
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