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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 5375 | . . 3 ⊢ {𝐴} ∈ V | |
| 2 | xpcomeng 8986 | . . 3 ⊢ (({𝐴} ∈ V ∧ 𝐵 ∈ 𝑊) → ({𝐴} × 𝐵) ≈ (𝐵 × {𝐴})) | |
| 3 | 1, 2 | mpan 690 | . 2 ⊢ (𝐵 ∈ 𝑊 → ({𝐴} × 𝐵) ≈ (𝐵 × {𝐴})) |
| 4 | xpsneng 8979 | . . 3 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐴 ∈ 𝑉) → (𝐵 × {𝐴}) ≈ 𝐵) | |
| 5 | 4 | ancoms 458 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐵 × {𝐴}) ≈ 𝐵) |
| 6 | entr 8931 | . 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 3436 {csn 4577 class class class wbr 5092 × cxp 5617 ≈ cen 8869 |
| 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 2701 ax-sep 5235 ax-nul 5245 ax-pow 5304 ax-pr 5371 ax-un 7671 |
| 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 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-rab 3395 df-v 3438 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4285 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4859 df-int 4897 df-br 5093 df-opab 5155 df-mpt 5174 df-id 5514 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-iota 6438 df-fun 6484 df-fn 6485 df-f 6486 df-f1 6487 df-fo 6488 df-f1o 6489 df-fv 6490 df-1st 7924 df-2nd 7925 df-er 8625 df-en 8873 |
| This theorem is referenced by: unxpwdom2 9480 undjudom 10062 endjudisj 10063 djuen 10064 dju1dif 10067 dju1p1e2 10068 djucomen 10072 djuassen 10073 xpdjuen 10074 mapdjuen 10075 djuxpdom 10080 djufi 10081 djuinf 10083 infdju1 10084 pwdjudom 10109 ackbij1lem8 10120 isfin4p1 10209 pwdjundom 10561 lgsquadlem1 27289 lgsquadlem2 27290 |
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