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| Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-xtagex | Structured version Visualization version GIF version | ||
| Description: The product of a set and the tagging of a set is a set. (Contributed by BJ, 2-Apr-2019.) |
| Ref | Expression |
|---|---|
| bj-xtagex | ⊢ (𝐴 ∈ 𝑉 → (𝐵 ∈ 𝑊 → (𝐴 × tag 𝐵) ∈ V)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elex 3471 | . . 3 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V) | |
| 2 | bj-tagex 37822 | . . 3 ⊢ (𝐵 ∈ V ↔ tag 𝐵 ∈ V) | |
| 3 | 1, 2 | sylib 221 | . 2 ⊢ (𝐵 ∈ 𝑊 → tag 𝐵 ∈ V) |
| 4 | bj-xpexg2 37795 | . 2 ⊢ (𝐴 ∈ 𝑉 → (tag 𝐵 ∈ V → (𝐴 × tag 𝐵) ∈ V)) | |
| 5 | 3, 4 | syl5 35 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐵 ∈ 𝑊 → (𝐴 × tag 𝐵) ∈ V)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2145 Vcvv 3450 × cxp 5645 tag bj-ctag 37809 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-opab 5167 df-xp 5653 df-rel 5654 df-bj-sngl 37801 df-bj-tag 37810 |
| This theorem is used by: bj-1uplex 37843 bj-2uplex 37857 |
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