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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 43954 | . 2 ⊢ ({𝐴} ≈ 1o ↔ 𝐴 ∈ V) | |
| 2 | snidb 4606 | . 2 ⊢ (𝐴 ∈ V ↔ 𝐴 ∈ {𝐴}) | |
| 3 | 1, 2 | bitri 275 | 1 ⊢ ({𝐴} ≈ 1o ↔ 𝐴 ∈ {𝐴}) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∈ wcel 2114 Vcvv 3430 {csn 4568 class class class wbr 5086 1oc1o 8389 ≈ cen 8881 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pr 5368 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-suc 6321 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-1o 8396 df-en 8885 |
| This theorem is referenced by: (None) |
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