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Mirrors > Home > ILE Home > Th. List > snid | GIF version |
Description: A set is a member of its singleton. Part of Theorem 7.6 of [Quine] p. 49. (Contributed by NM, 31-Dec-1993.) |
Ref | Expression |
---|---|
snid.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
snid | ⊢ 𝐴 ∈ {𝐴} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snid.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | snidb 3562 | . 2 ⊢ (𝐴 ∈ V ↔ 𝐴 ∈ {𝐴}) | |
3 | 1, 2 | mpbi 144 | 1 ⊢ 𝐴 ∈ {𝐴} |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 Vcvv 2689 {csn 3532 |
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-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-sn 3538 |
This theorem is referenced by: vsnid 3564 exsnrex 3573 rabsnt 3606 sneqr 3695 undifexmid 4125 exmidexmid 4128 exmid01 4129 exmidundif 4137 exmidundifim 4138 unipw 4147 intid 4154 ordtriexmidlem2 4444 ordtriexmid 4445 ordtri2orexmid 4446 regexmidlem1 4456 0elsucexmid 4488 ordpwsucexmid 4493 opthprc 4598 fsn 5600 fsn2 5602 fvsn 5623 fvsnun1 5625 acexmidlema 5773 acexmidlemb 5774 acexmidlemab 5776 brtpos0 6157 mapsn 6592 mapsncnv 6597 0elixp 6631 en1 6701 djulclr 6942 djurclr 6943 djulcl 6944 djurcl 6945 djuf1olem 6946 exmidonfinlem 7066 elreal2 7662 1exp 10353 hashinfuni 10555 ennnfonelemhom 11964 dvef 12896 djucllem 13178 bj-d0clsepcl 13294 exmid1stab 13368 |
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