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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 4891 | . 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 4774 |
| 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 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 |
| 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 4194 df-xp 4782 |
| This theorem is used by: oprabex 6365 oprabex3 6366 mpoexw 6453 fnpm 6934 mapsnf1o2 6983 xpsnen 7124 endisj 7127 xpcomen 7130 xpassen 7133 xpmapenlem 7154 0ct 7454 exmidomni 7489 exmidfodomrlemim 7560 2omotaplemst 7631 enqex 7734 nqex 7737 enq0ex 7813 nq0ex 7814 npex 7847 enrex 8111 addvalex 8218 axcnex 8233 addex 10070 mulex 10071 ixxex 10319 fxnn0nninf 10898 inftonninf 10901 shftfval 11609 nninfct 12844 qnumval 12991 qdenval 12992 qnnen 13381 prdsex 14280 metuex 15002 cnfldstr 15005 cnfldle 15014 znval 15081 znle 15082 znbaslemnn 15084 fnpsr 15163 txuni2 15494 txbas 15496 eltx 15497 txcnp 15509 txcnmpt 15511 txrest 15514 txlm 15517 reldvg 15917 pellexlem3 16243 |
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