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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 3475 | . . 3 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V) | |
| 2 | bj-tagex 37651 | . . 3 ⊢ (𝐵 ∈ V ↔ tag 𝐵 ∈ V) | |
| 3 | 1, 2 | sylib 221 | . 2 ⊢ (𝐵 ∈ 𝑊 → tag 𝐵 ∈ V) |
| 4 | bj-xpexg2 37624 | . 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 2142 Vcvv 3454 × cxp 5658 tag bj-ctag 37638 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-rep 5237 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-opab 5173 df-xp 5666 df-rel 5667 df-bj-sngl 37630 df-bj-tag 37639 |
| This theorem is used by: bj-1uplex 37672 bj-2uplex 37686 |
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