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Theorem repsf 14928
Description: The constructed function mapping a half-open range of nonnegative integers to a constant is a function. (Contributed by AV, 4-Nov-2018.)
Assertion
Ref Expression
repsf ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑆 repeatS 𝑁):(0..^𝑁)⟶𝑉)

Proof of Theorem repsf
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simpl 488 . . . . 5 ((𝑆 ∈ 𝑉 ∧ 𝑥 ∈ (0..^𝑁)) → 𝑆 ∈ 𝑉)
21ralrimiva 3154 . . . 4 (𝑆 ∈ 𝑉 → ∀𝑥 ∈ (0..^𝑁)𝑆 ∈ 𝑉)
32adantr 486 . . 3 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → ∀𝑥 ∈ (0..^𝑁)𝑆 ∈ 𝑉)
4 eqid 2760 . . . 4 (𝑥 ∈ (0..^𝑁) ↦ 𝑆) = (𝑥 ∈ (0..^𝑁) ↦ 𝑆)
54fmpt 7110 . . 3 (∀𝑥 ∈ (0..^𝑁)𝑆 ∈ 𝑉 ↔ (𝑥 ∈ (0..^𝑁) ↦ 𝑆):(0..^𝑁)⟶𝑉)
63, 5sylib 221 . 2 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑥 ∈ (0..^𝑁) ↦ 𝑆):(0..^𝑁)⟶𝑉)
7 reps 14925 . . 3 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑆 repeatS 𝑁) = (𝑥 ∈ (0..^𝑁) ↦ 𝑆))
87feq1d 6691 . 2 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → ((𝑆 repeatS 𝑁):(0..^𝑁)⟶𝑉 ↔ (𝑥 ∈ (0..^𝑁) ↦ 𝑆):(0..^𝑁)⟶𝑉))
96, 8mpbird 260 1 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑆 repeatS 𝑁):(0..^𝑁)⟶𝑉)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2144  ∀wral 3076   ↦ cmpt 5185  ⟶wf 6534  (class class class)co 7420  0cc0 11203  ℕ0cn0 12609  ..^cfzo 13791   repeatS creps 14923
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-reps 14924
This theorem is used by:  repsw  14930  repswlen  14931  repswswrd  14939  repsco  14995
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