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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 4887 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 4 | 1, 2, 3 | mp2an 430 | 1 ⊢ (𝐴 × 𝐵) ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 Vcvv 2821 × cxp 4770 |
| 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 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-opab 4191 df-xp 4778 |
| This theorem is referenced by: oprabex 6355 oprabex3 6356 mpoexw 6443 fnpm 6924 mapsnf1o2 6972 xpsnen 7113 endisj 7116 xpcomen 7119 xpassen 7122 xpmapenlem 7143 0ct 7441 exmidomni 7476 exmidfodomrlemim 7547 2omotaplemst 7618 enqex 7721 nqex 7724 enq0ex 7800 nq0ex 7801 npex 7834 enrex 8098 addvalex 8205 axcnex 8220 addex 10035 mulex 10036 ixxex 10284 fxnn0nninf 10859 inftonninf 10862 shftfval 11569 nninfct 12801 qnumval 12946 qdenval 12947 qnnen 13305 prdsex 14155 metuex 14875 cnfldstr 14878 cnfldle 14887 znval 14954 znle 14955 znbaslemnn 14957 fnpsr 15034 txuni2 15340 txbas 15342 eltx 15343 txcnp 15355 txcnmpt 15357 txrest 15360 txlm 15363 reldvg 15763 pellexlem3 16076 |
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