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| Mirrors > Home > MPE Home > Th. List > xpsnen2g | Structured version Visualization version GIF version | ||
| Description: A set is equinumerous to its Cartesian product with a singleton on the left. (Contributed by Stefan O'Rear, 21-Nov-2014.) |
| Ref | Expression |
|---|---|
| xpsnen2g | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} × 𝐵) ≈ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snex 5411 | . . 3 ⊢ {𝐴} ∈ V | |
| 2 | xpcomeng 9083 | . . 3 ⊢ (({𝐴} ∈ V ∧ 𝐵 ∈ 𝑊) → ({𝐴} × 𝐵) ≈ (𝐵 × {𝐴})) | |
| 3 | 1, 2 | mpan 690 | . 2 ⊢ (𝐵 ∈ 𝑊 → ({𝐴} × 𝐵) ≈ (𝐵 × {𝐴})) |
| 4 | xpsneng 9075 | . . 3 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐴 ∈ 𝑉) → (𝐵 × {𝐴}) ≈ 𝐵) | |
| 5 | 4 | ancoms 458 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐵 × {𝐴}) ≈ 𝐵) |
| 6 | entr 9025 | . 2 ⊢ ((({𝐴} × 𝐵) ≈ (𝐵 × {𝐴}) ∧ (𝐵 × {𝐴}) ≈ 𝐵) → ({𝐴} × 𝐵) ≈ 𝐵) | |
| 7 | 3, 5, 6 | syl2an2 686 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} × 𝐵) ≈ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2109 Vcvv 3464 {csn 4606 class class class wbr 5124 × cxp 5657 ≈ cen 8961 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2708 ax-sep 5271 ax-nul 5281 ax-pow 5340 ax-pr 5407 ax-un 7734 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2810 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3062 df-rab 3421 df-v 3466 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4889 df-int 4928 df-br 5125 df-opab 5187 df-mpt 5207 df-id 5553 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6489 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-1st 7993 df-2nd 7994 df-er 8724 df-en 8965 |
| This theorem is referenced by: unxpwdom2 9607 undjudom 10187 endjudisj 10188 djuen 10189 dju1dif 10192 dju1p1e2 10193 djucomen 10197 djuassen 10198 xpdjuen 10199 mapdjuen 10200 djuxpdom 10205 djufi 10206 djuinf 10208 infdju1 10209 pwdjudom 10234 ackbij1lem8 10245 isfin4p1 10334 pwdjundom 10686 lgsquadlem1 27348 lgsquadlem2 27349 |
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