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Mirrors > Home > ILE Home > Th. List > iprc | GIF version |
Description: The identity function is a proper class. This means, for example, that we cannot use it as a member of the class of continuous functions unless it is restricted to a set. (Contributed by NM, 1-Jan-2007.) |
Ref | Expression |
---|---|
iprc | ⊢ ¬ I ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vprc 3909 | . . 3 ⊢ ¬ V ∈ V | |
2 | dmi 4568 | . . . 4 ⊢ dom I = V | |
3 | 2 | eleq1i 2144 | . . 3 ⊢ (dom I ∈ V ↔ V ∈ V) |
4 | 1, 3 | mtbir 628 | . 2 ⊢ ¬ dom I ∈ V |
5 | dmexg 4614 | . 2 ⊢ ( I ∈ V → dom I ∈ V) | |
6 | 4, 5 | mto 620 | 1 ⊢ ¬ I ∈ V |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∈ wcel 1433 Vcvv 2601 I cid 4043 dom cdm 4363 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 ax-un 4188 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-br 3786 df-opab 3840 df-id 4048 df-xp 4369 df-rel 4370 df-cnv 4371 df-dm 4373 df-rn 4374 |
This theorem is referenced by: (None) |
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