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| Mirrors > Home > ILE Home > Th. List > en1m | GIF version | ||
| Description: A set with one element is inhabited. (Contributed by Jim Kingdon, 3-Jan-2026.) |
| Ref | Expression |
|---|---|
| en1m | ⊢ (𝐴 ≈ 1o → ∃𝑥 𝑥 ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | en1uniel 6946 | . 2 ⊢ (𝐴 ≈ 1o → ∪ 𝐴 ∈ 𝐴) | |
| 2 | elex2 2816 | . 2 ⊢ (∪ 𝐴 ∈ 𝐴 → ∃𝑥 𝑥 ∈ 𝐴) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝐴 ≈ 1o → ∃𝑥 𝑥 ∈ 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∃wex 1538 ∈ wcel 2200 ∪ cuni 3887 class class class wbr 4082 1oc1o 6545 ≈ cen 6875 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-nul 4209 ax-pow 4257 ax-pr 4292 ax-un 4521 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-reu 2515 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3888 df-br 4083 df-opab 4145 df-id 4381 df-suc 4459 df-xp 4722 df-rel 4723 df-cnv 4724 df-co 4725 df-dm 4726 df-rn 4727 df-res 4728 df-ima 4729 df-iota 5274 df-fun 5316 df-fn 5317 df-f 5318 df-f1 5319 df-fo 5320 df-f1o 5321 df-fv 5322 df-1o 6552 df-en 6878 |
| This theorem is referenced by: upgrm 15885 upgruhgr 15896 uspgrushgr 15963 |
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