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| Mirrors > Home > MPE Home > Th. List > Mathboxes > snen1el | Structured version Visualization version GIF version | ||
| Description: A singleton is equinumerous to ordinal one if its content is an element of it. (Contributed by RP, 8-Oct-2023.) |
| Ref | Expression |
|---|---|
| snen1el | ⊢ ({𝐴} ≈ 1o ↔ 𝐴 ∈ {𝐴}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snen1g 44048 | . 2 ⊢ ({𝐴} ≈ 1o ↔ 𝐴 ∈ V) | |
| 2 | snidb 4614 | . 2 ⊢ (𝐴 ∈ V ↔ 𝐴 ∈ {𝐴}) | |
| 3 | 1, 2 | bitri 277 | 1 ⊢ ({𝐴} ≈ 1o ↔ 𝐴 ∈ {𝐴}) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∈ wcel 2136 Vcvv 3448 {csn 4576 class class class wbr 5094 1oc1o 8418 ≈ cen 8913 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1809 ax-4 1823 ax-5 1924 ax-6 1981 ax-7 2022 ax-8 2138 ax-9 2146 ax-10 2169 ax-12 2206 ax-ext 2728 ax-sep 5240 ax-nul 5250 ax-pr 5384 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3an 1097 df-tru 1557 df-fal 1567 df-ex 1794 df-nf 1798 df-sb 2085 df-mo 2560 df-eu 2590 df-clab 2735 df-cleq 2748 df-clel 2831 df-ne 2952 df-ral 3071 df-rex 3081 df-reu 3362 df-rab 3409 df-v 3450 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4281 df-if 4475 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-br 5095 df-opab 5157 df-id 5535 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-suc 6341 df-iota 6466 df-fun 6512 df-fn 6513 df-f 6514 df-f1 6515 df-fo 6516 df-f1o 6517 df-fv 6518 df-1o 8425 df-en 8917 |
| This theorem is referenced by: (None) |
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