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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 4889 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 4 | 1, 2, 3 | mp2an 430 | 1 ⊢ (𝐴 × 𝐵) ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 Vcvv 2821 × cxp 4772 |
| This proof depends on 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 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 |
| This proof 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 3715 df-pr 3716 df-op 3718 df-uni 3936 df-opab 4193 df-xp 4780 |
| This theorem is used by: oprabex 6361 oprabex3 6362 mpoexw 6449 fnpm 6930 mapsnf1o2 6978 xpsnen 7119 endisj 7122 xpcomen 7125 xpassen 7128 xpmapenlem 7149 0ct 7447 exmidomni 7482 exmidfodomrlemim 7553 2omotaplemst 7624 enqex 7727 nqex 7730 enq0ex 7806 nq0ex 7807 npex 7840 enrex 8104 addvalex 8211 axcnex 8226 addex 10054 mulex 10055 ixxex 10303 fxnn0nninf 10878 inftonninf 10881 shftfval 11588 nninfct 12820 qnumval 12965 qdenval 12966 qnnen 13324 prdsex 14174 metuex 14894 cnfldstr 14897 cnfldle 14906 znval 14973 znle 14974 znbaslemnn 14976 fnpsr 15053 txuni2 15359 txbas 15361 eltx 15362 txcnp 15374 txcnmpt 15376 txrest 15379 txlm 15382 reldvg 15782 pellexlem3 16099 |
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