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Mirrors > Home > ILE Home > Th. List > relsn2m | GIF version |
Description: A singleton is a relation iff it has an inhabited domain. (Contributed by Jim Kingdon, 16-Dec-2018.) |
Ref | Expression |
---|---|
relsn2m.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
relsn2m | ⊢ (Rel {𝐴} ↔ ∃𝑥 𝑥 ∈ dom {𝐴}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | relsn2m.1 | . . 3 ⊢ 𝐴 ∈ V | |
2 | 1 | relsn 4652 | . 2 ⊢ (Rel {𝐴} ↔ 𝐴 ∈ (V × V)) |
3 | dmsnm 5012 | . 2 ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥 𝑥 ∈ dom {𝐴}) | |
4 | 2, 3 | bitri 183 | 1 ⊢ (Rel {𝐴} ↔ ∃𝑥 𝑥 ∈ dom {𝐴}) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 104 ∃wex 1469 ∈ wcel 1481 Vcvv 2689 {csn 3532 × cxp 4545 dom cdm 4547 Rel wrel 4552 |
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-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 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-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-br 3938 df-opab 3998 df-xp 4553 df-rel 4554 df-dm 4557 |
This theorem is referenced by: (None) |
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