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Mirrors > Home > ILE Home > Th. List > intsn | GIF version |
Description: The intersection of a singleton is its member. Theorem 70 of [Suppes] p. 41. (Contributed by NM, 29-Sep-2002.) |
Ref | Expression |
---|---|
intsn.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
intsn | ⊢ ∩ {𝐴} = 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | intsn.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | intsng 3775 | . 2 ⊢ (𝐴 ∈ V → ∩ {𝐴} = 𝐴) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∩ {𝐴} = 𝐴 |
Colors of variables: wff set class |
Syntax hints: = wceq 1316 ∈ wcel 1465 Vcvv 2660 {csn 3497 ∩ cint 3741 |
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 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-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 |
This theorem depends on definitions: df-bi 116 df-tru 1319 df-nf 1422 df-sb 1721 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ral 2398 df-v 2662 df-un 3045 df-in 3047 df-sn 3503 df-pr 3504 df-int 3742 |
This theorem is referenced by: uniintsnr 3777 intunsn 3779 op1stb 4369 op2ndb 4992 ssfii 6830 |
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