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| Mirrors > Home > MPE Home > Th. List > Mathboxes > elxpcbasex1 | Structured version Visualization version GIF version | ||
| Description: A non-empty base set of the product category indicates the existence of the first factor of the product category. (Contributed by Zhi Wang, 8-Oct-2025.) (Proof shortened by SN, 15-Oct-2025.) |
| Ref | Expression |
|---|---|
| elxpcbasex1.t | ⊢ 𝑇 = (𝐶 ×c 𝐷) |
| elxpcbasex1.b | ⊢ 𝐵 = (Base‘𝑇) |
| elxpcbasex1.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
| Ref | Expression |
|---|---|
| elxpcbasex1 | ⊢ (𝜑 → 𝐶 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxpcbasex1.x | . 2 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
| 2 | elxpcbasex1.t | . . 3 ⊢ 𝑇 = (𝐶 ×c 𝐷) | |
| 3 | elxpcbasex1.b | . . 3 ⊢ 𝐵 = (Base‘𝑇) | |
| 4 | reldmxpc 50024 | . . 3 ⊢ Rel dom ×c | |
| 5 | 2, 3, 4 | strov2rcl 17272 | . 2 ⊢ (𝑋 ∈ 𝐵 → 𝐶 ∈ V) |
| 6 | 1, 5 | syl 18 | 1 ⊢ (𝜑 → 𝐶 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1570 ∈ wcel 2143 Vcvv 3455 ‘cfv 6536 (class class class)co 7410 Basecbs 17264 ×c cxpc 18219 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-cnex 11151 ax-1cn 11153 ax-addcl 11155 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-tp 4594 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-nn 12229 df-slot 17237 df-ndx 17249 df-base 17265 df-xpc 18223 |
| This theorem is referenced by: swapf1a 50047 swapf2vala 50048 swapf2f1oaALT 50056 |
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