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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 4869 | . 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 2205 Vcvv 2815 × cxp 4752 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-rex 2528 df-v 2817 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-opab 4177 df-xp 4760 |
| This theorem is referenced by: oprabex 6334 oprabex3 6335 mpoexw 6422 fnpm 6903 mapsnf1o2 6944 xpsnen 7085 endisj 7088 xpcomen 7091 xpassen 7094 xpmapenlem 7115 0ct 7411 exmidomni 7446 exmidfodomrlemim 7517 2omotaplemst 7588 enqex 7691 nqex 7694 enq0ex 7770 nq0ex 7771 npex 7804 enrex 8068 addvalex 8175 axcnex 8190 addex 10005 mulex 10006 ixxex 10254 fxnn0nninf 10828 inftonninf 10831 shftfval 11534 nninfct 12765 qnumval 12910 qdenval 12911 qnnen 13269 prdsex 14117 metuex 14832 cnfldstr 14835 cnfldle 14844 znval 14913 znle 14914 znbaslemnn 14916 fnpsr 14944 txuni2 15250 txbas 15252 eltx 15253 txcnp 15265 txcnmpt 15267 txrest 15270 txlm 15273 reldvg 15673 pellexlem3 15976 |
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