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Theorem wrdnval 14521

Description: Words of a fixed length are mappings from a fixed half-open integer interval. (Contributed by Alexander van der Vekens, 25-Mar-2018.) (Proof shortened by AV, 13-May-2020.)

**Assertion**
Ref	Expression
wrdnval	⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → {𝑤 ∈ Word 𝑉 ∣ (♯‘𝑤) = 𝑁} = (𝑉 ↑_m (0..^𝑁)))

Distinct variable groups: 𝑤,𝑁 𝑤,𝑉 𝑤,𝑋

**Proof of Theorem wrdnval**
Step	Hyp	Ref	Expression
1		df-rab 3429	. 2 ⊢ {𝑤 ∈ Word 𝑉 ∣ (♯‘𝑤) = 𝑁} = {𝑤 ∣ (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁)}
2		ovexd 7449	. . . . 5 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (0..^𝑁) ∈ V)
3		elmapg 8851	. . . . 5 ⊢ ((𝑉 ∈ 𝑋 ∧ (0..^𝑁) ∈ V) → (𝑤 ∈ (𝑉 ↑_m (0..^𝑁)) ↔ 𝑤:(0..^𝑁)⟶𝑉))
4	2, 3	syldan 590	. . . 4 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑤 ∈ (𝑉 ↑_m (0..^𝑁)) ↔ 𝑤:(0..^𝑁)⟶𝑉))
5		iswrdi 14494	. . . . . . . 8 ⊢ (𝑤:(0..^𝑁)⟶𝑉 → 𝑤 ∈ Word 𝑉)
6	5	adantl 481	. . . . . . 7 ⊢ (((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) ∧ 𝑤:(0..^𝑁)⟶𝑉) → 𝑤 ∈ Word 𝑉)
7		fnfzo0hash 14435	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑤:(0..^𝑁)⟶𝑉) → (♯‘𝑤) = 𝑁)
8	7	adantll 713	. . . . . . 7 ⊢ (((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) ∧ 𝑤:(0..^𝑁)⟶𝑉) → (♯‘𝑤) = 𝑁)
9	6, 8	jca 511	. . . . . 6 ⊢ (((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) ∧ 𝑤:(0..^𝑁)⟶𝑉) → (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁))
10	9	ex 412	. . . . 5 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑤:(0..^𝑁)⟶𝑉 → (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁)))
11		wrdf 14495	. . . . . . 7 ⊢ (𝑤 ∈ Word 𝑉 → 𝑤:(0..^(♯‘𝑤))⟶𝑉)
12		oveq2 7422	. . . . . . . 8 ⊢ ((♯‘𝑤) = 𝑁 → (0..^(♯‘𝑤)) = (0..^𝑁))
13	12	feq2d 6702	. . . . . . 7 ⊢ ((♯‘𝑤) = 𝑁 → (𝑤:(0..^(♯‘𝑤))⟶𝑉 ↔ 𝑤:(0..^𝑁)⟶𝑉))
14	11, 13	syl5ibcom 244	. . . . . 6 ⊢ (𝑤 ∈ Word 𝑉 → ((♯‘𝑤) = 𝑁 → 𝑤:(0..^𝑁)⟶𝑉))
15	14	imp 406	. . . . 5 ⊢ ((𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁) → 𝑤:(0..^𝑁)⟶𝑉)
16	10, 15	impbid1 224	. . . 4 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑤:(0..^𝑁)⟶𝑉 ↔ (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁)))
17	4, 16	bitrd 279	. . 3 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑤 ∈ (𝑉 ↑_m (0..^𝑁)) ↔ (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁)))
18	17	eqabdv 2863	. 2 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑉 ↑_m (0..^𝑁)) = {𝑤 ∣ (𝑤 ∈ Word 𝑉 ∧ (♯‘𝑤) = 𝑁)})
19	1, 18	eqtr4id 2787	1 ⊢ ((𝑉 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → {𝑤 ∈ Word 𝑉 ∣ (♯‘𝑤) = 𝑁} = (𝑉 ↑_m (0..^𝑁)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 {cab 2705 {crab 3428 Vcvv 3470 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 ↑_m cmap 8838 0cc0 11132 ℕ₀cn0 12496 ..^cfzo 13653 ♯chash 14315 Word cword 14490

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-nn 12237 df-n0 12497 df-z 12583 df-uz 12847 df-fz 13511 df-fzo 13654 df-hash 14316 df-word 14491

This theorem is referenced by: wrdmap 14522 hashwrdn 14523 naryfvalelwrdf 47700

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