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Mirrors > Home > ILE Home > Th. List > en2sn | GIF version |
Description: Two singletons are equinumerous. (Contributed by NM, 9-Nov-2003.) |
Ref | Expression |
---|---|
en2sn | ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝐴} ≈ {𝐵}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ensn1g 6659 | . 2 ⊢ (𝐴 ∈ 𝐶 → {𝐴} ≈ 1o) | |
2 | ensn1g 6659 | . . 3 ⊢ (𝐵 ∈ 𝐷 → {𝐵} ≈ 1o) | |
3 | 2 | ensymd 6645 | . 2 ⊢ (𝐵 ∈ 𝐷 → 1o ≈ {𝐵}) |
4 | entr 6646 | . 2 ⊢ (({𝐴} ≈ 1o ∧ 1o ≈ {𝐵}) → {𝐴} ≈ {𝐵}) | |
5 | 1, 3, 4 | syl2an 287 | 1 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → {𝐴} ≈ {𝐵}) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 1465 {csn 3497 class class class wbr 3899 1oc1o 6274 ≈ cen 6600 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-nul 4024 ax-pow 4068 ax-pr 4101 ax-un 4325 |
This theorem depends on definitions: df-bi 116 df-3an 949 df-tru 1319 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ral 2398 df-rex 2399 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-br 3900 df-opab 3960 df-id 4185 df-suc 4263 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-res 4521 df-ima 4522 df-fun 5095 df-fn 5096 df-f 5097 df-f1 5098 df-fo 5099 df-f1o 5100 df-1o 6281 df-er 6397 df-en 6603 |
This theorem is referenced by: enpr2d 6679 fiunsnnn 6743 unsnfi 6775 frecfzennn 10167 hashsng 10512 |
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