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Mirrors > Home > MPE Home > Th. List > idfn | Structured version Visualization version GIF version |
Description: The identity relation is a function on the universal class. See also funi 6390. (Contributed by BJ, 23-Dec-2023.) |
Ref | Expression |
---|---|
idfn | ⊢ I Fn V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | funi 6390 | . 2 ⊢ Fun I | |
2 | dmi 5775 | . 2 ⊢ dom I = V | |
3 | df-fn 6361 | . 2 ⊢ ( I Fn V ↔ (Fun I ∧ dom I = V)) | |
4 | 1, 2, 3 | mpbir2an 711 | 1 ⊢ I Fn V |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1543 Vcvv 3398 I cid 5439 dom cdm 5536 Fun wfun 6352 Fn wfn 6353 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pr 5307 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-sn 4528 df-pr 4530 df-op 4534 df-br 5040 df-opab 5102 df-id 5440 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-fun 6360 df-fn 6361 |
This theorem is referenced by: fnresi 6484 |
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