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| Mirrors > Home > MPE Home > Th. List > Mathboxes > elxpcbasex2 | Structured version Visualization version GIF version | ||
| Description: A non-empty base set of the product category indicates the existence of the second 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 |
|---|---|
| elxpcbasex2 | ⊢ (𝜑 → 𝐷 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxpcbasex1.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
| 2 | reldmxpc 49736 | . . . 4 ⊢ Rel dom ×c | |
| 3 | elxpcbasex1.t | . . . 4 ⊢ 𝑇 = (𝐶 ×c 𝐷) | |
| 4 | elxpcbasex1.b | . . . 4 ⊢ 𝐵 = (Base‘𝑇) | |
| 5 | 2, 3, 4 | elbasov 17180 | . . 3 ⊢ (𝑋 ∈ 𝐵 → (𝐶 ∈ V ∧ 𝐷 ∈ V)) |
| 6 | 1, 5 | syl 17 | . 2 ⊢ (𝜑 → (𝐶 ∈ V ∧ 𝐷 ∈ V)) |
| 7 | 6 | simprd 495 | 1 ⊢ (𝜑 → 𝐷 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 Vcvv 3430 ‘cfv 6493 (class class class)co 7361 Basecbs 17173 ×c cxpc 18128 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 ax-cnex 11088 ax-1cn 11090 ax-addcl 11092 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-tp 4573 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-ov 7364 df-oprab 7365 df-mpo 7366 df-om 7812 df-1st 7936 df-2nd 7937 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-nn 12169 df-slot 17146 df-ndx 17158 df-base 17174 df-xpc 18132 |
| This theorem is referenced by: swapf1a 49759 swapf2vala 49760 swapf2f1oaALT 49768 |
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