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Theorem resunimafz0 10574
Description: The union of a restriction by an image over an open range of nonnegative integers and a singleton of an ordered pair is a restriction by an image over an interval of nonnegative integers. (Contributed by Mario Carneiro, 8-Apr-2015.) (Revised by AV, 20-Feb-2021.)
Hypotheses
Ref Expression
resunimafz0.i (𝜑 → Fun 𝐼)
resunimafz0.f (𝜑𝐹:(0..^(♯‘𝐹))⟶dom 𝐼)
resunimafz0.n (𝜑𝑁 ∈ (0..^(♯‘𝐹)))
Assertion
Ref Expression
resunimafz0 (𝜑 → (𝐼 ↾ (𝐹 “ (0...𝑁))) = ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩}))

Proof of Theorem resunimafz0
StepHypRef Expression
1 imaundi 4951 . . . . 5 (𝐹 “ ((0..^𝑁) ∪ {𝑁})) = ((𝐹 “ (0..^𝑁)) ∪ (𝐹 “ {𝑁}))
2 resunimafz0.n . . . . . . . . 9 (𝜑𝑁 ∈ (0..^(♯‘𝐹)))
3 elfzonn0 9963 . . . . . . . . 9 (𝑁 ∈ (0..^(♯‘𝐹)) → 𝑁 ∈ ℕ0)
42, 3syl 14 . . . . . . . 8 (𝜑𝑁 ∈ ℕ0)
5 elnn0uz 9363 . . . . . . . 8 (𝑁 ∈ ℕ0𝑁 ∈ (ℤ‘0))
64, 5sylib 121 . . . . . . 7 (𝜑𝑁 ∈ (ℤ‘0))
7 fzisfzounsn 10013 . . . . . . 7 (𝑁 ∈ (ℤ‘0) → (0...𝑁) = ((0..^𝑁) ∪ {𝑁}))
86, 7syl 14 . . . . . 6 (𝜑 → (0...𝑁) = ((0..^𝑁) ∪ {𝑁}))
98imaeq2d 4881 . . . . 5 (𝜑 → (𝐹 “ (0...𝑁)) = (𝐹 “ ((0..^𝑁) ∪ {𝑁})))
10 resunimafz0.f . . . . . . . 8 (𝜑𝐹:(0..^(♯‘𝐹))⟶dom 𝐼)
1110ffnd 5273 . . . . . . 7 (𝜑𝐹 Fn (0..^(♯‘𝐹)))
12 fnsnfv 5480 . . . . . . 7 ((𝐹 Fn (0..^(♯‘𝐹)) ∧ 𝑁 ∈ (0..^(♯‘𝐹))) → {(𝐹𝑁)} = (𝐹 “ {𝑁}))
1311, 2, 12syl2anc 408 . . . . . 6 (𝜑 → {(𝐹𝑁)} = (𝐹 “ {𝑁}))
1413uneq2d 3230 . . . . 5 (𝜑 → ((𝐹 “ (0..^𝑁)) ∪ {(𝐹𝑁)}) = ((𝐹 “ (0..^𝑁)) ∪ (𝐹 “ {𝑁})))
151, 9, 143eqtr4a 2198 . . . 4 (𝜑 → (𝐹 “ (0...𝑁)) = ((𝐹 “ (0..^𝑁)) ∪ {(𝐹𝑁)}))
1615reseq2d 4819 . . 3 (𝜑 → (𝐼 ↾ (𝐹 “ (0...𝑁))) = (𝐼 ↾ ((𝐹 “ (0..^𝑁)) ∪ {(𝐹𝑁)})))
17 resundi 4832 . . 3 (𝐼 ↾ ((𝐹 “ (0..^𝑁)) ∪ {(𝐹𝑁)})) = ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ (𝐼 ↾ {(𝐹𝑁)}))
1816, 17syl6eq 2188 . 2 (𝜑 → (𝐼 ↾ (𝐹 “ (0...𝑁))) = ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ (𝐼 ↾ {(𝐹𝑁)})))
19 resunimafz0.i . . . . 5 (𝜑 → Fun 𝐼)
20 funfn 5153 . . . . 5 (Fun 𝐼𝐼 Fn dom 𝐼)
2119, 20sylib 121 . . . 4 (𝜑𝐼 Fn dom 𝐼)
2210, 2ffvelrnd 5556 . . . 4 (𝜑 → (𝐹𝑁) ∈ dom 𝐼)
23 fnressn 5606 . . . 4 ((𝐼 Fn dom 𝐼 ∧ (𝐹𝑁) ∈ dom 𝐼) → (𝐼 ↾ {(𝐹𝑁)}) = {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
2421, 22, 23syl2anc 408 . . 3 (𝜑 → (𝐼 ↾ {(𝐹𝑁)}) = {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
2524uneq2d 3230 . 2 (𝜑 → ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ (𝐼 ↾ {(𝐹𝑁)})) = ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩}))
2618, 25eqtrd 2172 1 (𝜑 → (𝐼 ↾ (𝐹 “ (0...𝑁))) = ((𝐼 ↾ (𝐹 “ (0..^𝑁))) ∪ {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩}))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1331  wcel 1480  cun 3069  {csn 3527  cop 3530  dom cdm 4539  cres 4541  cima 4542  Fun wfun 5117   Fn wfn 5118  wf 5119  cfv 5123  (class class class)co 5774  0cc0 7620  0cn0 8977  cuz 9326  ...cfz 9790  ..^cfzo 9919  chash 10521
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-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131  ax-un 4355  ax-setind 4452  ax-cnex 7711  ax-resscn 7712  ax-1cn 7713  ax-1re 7714  ax-icn 7715  ax-addcl 7716  ax-addrcl 7717  ax-mulcl 7718  ax-addcom 7720  ax-addass 7722  ax-distr 7724  ax-i2m1 7725  ax-0lt1 7726  ax-0id 7728  ax-rnegex 7729  ax-cnre 7731  ax-pre-ltirr 7732  ax-pre-ltwlin 7733  ax-pre-lttrn 7734  ax-pre-apti 7735  ax-pre-ltadd 7736
This theorem depends on definitions:  df-bi 116  df-3or 963  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-nel 2404  df-ral 2421  df-rex 2422  df-reu 2423  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-int 3772  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-ima 4552  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130  df-fv 5131  df-riota 5730  df-ov 5777  df-oprab 5778  df-mpo 5779  df-1st 6038  df-2nd 6039  df-pnf 7802  df-mnf 7803  df-xr 7804  df-ltxr 7805  df-le 7806  df-sub 7935  df-neg 7936  df-inn 8721  df-n0 8978  df-z 9055  df-uz 9327  df-fz 9791  df-fzo 9920
This theorem is referenced by: (None)
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