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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 50475 | . . 3 ⊢ Rel dom ×c | |
| 5 | 2, 3, 4 | strov2rcl 17402 | . 2 ⊢ (𝑋 ∈ 𝐵 → 𝐶 ∈ V) |
| 6 | 1, 5 | syl 18 | 1 ⊢ (𝜑 → 𝐶 ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 Vcvv 3450 ‘cfv 6541 (class class class)co 7422 Basecbs 17394 ×c cxpc 18349 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7753 ax-cnex 11261 ax-1cn 11263 ax-addcl 11265 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-ov 7425 df-oprab 7426 df-mpo 7427 df-om 7880 df-1st 8003 df-2nd 8004 df-frecs 8304 df-wrecs 8335 df-recs 8384 df-rdg 8423 df-nn 12341 df-slot 17367 df-ndx 17379 df-base 17395 df-xpc 18353 |
| This theorem is used by: swapf1a 50498 swapf2vala 50499 swapf2f1oaALT 50507 |
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