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Mirrors > Home > MPE Home > Th. List > Mathboxes > itcoval0 | Structured version Visualization version GIF version |
Description: A function iterated zero times (defined as identity function). (Contributed by AV, 2-May-2024.) |
Ref | Expression |
---|---|
itcoval0 | ⊢ (𝐹 ∈ 𝑉 → ((IterComp‘𝐹)‘0) = ( I ↾ dom 𝐹)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | itcoval 45440 | . . 3 ⊢ (𝐹 ∈ 𝑉 → (IterComp‘𝐹) = seq0((𝑔 ∈ V, 𝑗 ∈ V ↦ (𝐹 ∘ 𝑔)), (𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹)))) | |
2 | 1 | fveq1d 6660 | . 2 ⊢ (𝐹 ∈ 𝑉 → ((IterComp‘𝐹)‘0) = (seq0((𝑔 ∈ V, 𝑗 ∈ V ↦ (𝐹 ∘ 𝑔)), (𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹)))‘0)) |
3 | 0z 12031 | . . 3 ⊢ 0 ∈ ℤ | |
4 | eqidd 2759 | . . . 4 ⊢ (𝐹 ∈ 𝑉 → (𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹)) = (𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹))) | |
5 | iftrue 4426 | . . . . 5 ⊢ (𝑖 = 0 → if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹) = ( I ↾ dom 𝐹)) | |
6 | 5 | adantl 485 | . . . 4 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝑖 = 0) → if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹) = ( I ↾ dom 𝐹)) |
7 | 0nn0 11949 | . . . . 5 ⊢ 0 ∈ ℕ0 | |
8 | 7 | a1i 11 | . . . 4 ⊢ (𝐹 ∈ 𝑉 → 0 ∈ ℕ0) |
9 | dmexg 7613 | . . . . 5 ⊢ (𝐹 ∈ 𝑉 → dom 𝐹 ∈ V) | |
10 | 9 | resiexd 6970 | . . . 4 ⊢ (𝐹 ∈ 𝑉 → ( I ↾ dom 𝐹) ∈ V) |
11 | 4, 6, 8, 10 | fvmptd 6766 | . . 3 ⊢ (𝐹 ∈ 𝑉 → ((𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹))‘0) = ( I ↾ dom 𝐹)) |
12 | 3, 11 | seq1i 13432 | . 2 ⊢ (𝐹 ∈ 𝑉 → (seq0((𝑔 ∈ V, 𝑗 ∈ V ↦ (𝐹 ∘ 𝑔)), (𝑖 ∈ ℕ0 ↦ if(𝑖 = 0, ( I ↾ dom 𝐹), 𝐹)))‘0) = ( I ↾ dom 𝐹)) |
13 | 2, 12 | eqtrd 2793 | 1 ⊢ (𝐹 ∈ 𝑉 → ((IterComp‘𝐹)‘0) = ( I ↾ dom 𝐹)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 Vcvv 3409 ifcif 4420 ↦ cmpt 5112 I cid 5429 dom cdm 5524 ↾ cres 5526 ∘ ccom 5528 ‘cfv 6335 ∈ cmpo 7152 0cc0 10575 ℕ0cn0 11934 seqcseq 13418 IterCompcitco 45436 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-rep 5156 ax-sep 5169 ax-nul 5176 ax-pow 5234 ax-pr 5298 ax-un 7459 ax-inf2 9137 ax-cnex 10631 ax-resscn 10632 ax-1cn 10633 ax-icn 10634 ax-addcl 10635 ax-addrcl 10636 ax-mulcl 10637 ax-mulrcl 10638 ax-mulcom 10639 ax-addass 10640 ax-mulass 10641 ax-distr 10642 ax-i2m1 10643 ax-1ne0 10644 ax-1rid 10645 ax-rnegex 10646 ax-rrecex 10647 ax-cnre 10648 ax-pre-lttri 10649 ax-pre-lttrn 10650 ax-pre-ltadd 10651 ax-pre-mulgt0 10652 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-reu 3077 df-rab 3079 df-v 3411 df-sbc 3697 df-csb 3806 df-dif 3861 df-un 3863 df-in 3865 df-ss 3875 df-pss 3877 df-nul 4226 df-if 4421 df-pw 4496 df-sn 4523 df-pr 4525 df-tp 4527 df-op 4529 df-uni 4799 df-iun 4885 df-br 5033 df-opab 5095 df-mpt 5113 df-tr 5139 df-id 5430 df-eprel 5435 df-po 5443 df-so 5444 df-fr 5483 df-we 5485 df-xp 5530 df-rel 5531 df-cnv 5532 df-co 5533 df-dm 5534 df-rn 5535 df-res 5536 df-ima 5537 df-pred 6126 df-ord 6172 df-on 6173 df-lim 6174 df-suc 6175 df-iota 6294 df-fun 6337 df-fn 6338 df-f 6339 df-f1 6340 df-fo 6341 df-f1o 6342 df-fv 6343 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7580 df-2nd 7694 df-wrecs 7957 df-recs 8018 df-rdg 8056 df-er 8299 df-en 8528 df-dom 8529 df-sdom 8530 df-pnf 10715 df-mnf 10716 df-xr 10717 df-ltxr 10718 df-le 10719 df-sub 10910 df-neg 10911 df-nn 11675 df-n0 11935 df-z 12021 df-uz 12283 df-seq 13419 df-itco 45438 |
This theorem is referenced by: itcoval1 45442 itcoval0mpt 45445 itcovalendof 45448 |
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