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| Mirrors > Home > MPE Home > Th. List > Mathboxes > sticksstones5 | Structured version Visualization version GIF version | ||
| Description: Count the number of strictly monotonely increasing functions on finite domains and codomains. (Contributed by metakunt, 28-Sep-2024.) |
| Ref | Expression |
|---|---|
| sticksstones5.1 | ⊢ (𝜑 → 𝑁 ∈ ℕ0) |
| sticksstones5.2 | ⊢ (𝜑 → 𝐾 ∈ ℕ0) |
| sticksstones5.3 | ⊢ 𝐴 = {𝑓 ∣ (𝑓:(1...𝐾)⟶(1...𝑁) ∧ ∀𝑥 ∈ (1...𝐾)∀𝑦 ∈ (1...𝐾)(𝑥 < 𝑦 → (𝑓‘𝑥) < (𝑓‘𝑦)))} |
| Ref | Expression |
|---|---|
| sticksstones5 | ⊢ (𝜑 → (♯‘𝐴) = (𝑁C𝐾)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sticksstones5.1 | . . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0) | |
| 2 | sticksstones5.2 | . . . 4 ⊢ (𝜑 → 𝐾 ∈ ℕ0) | |
| 3 | eqid 2760 | . . . 4 ⊢ {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾} = {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾} | |
| 4 | sticksstones5.3 | . . . 4 ⊢ 𝐴 = {𝑓 ∣ (𝑓:(1...𝐾)⟶(1...𝑁) ∧ ∀𝑥 ∈ (1...𝐾)∀𝑦 ∈ (1...𝐾)(𝑥 < 𝑦 → (𝑓‘𝑥) < (𝑓‘𝑦)))} | |
| 5 | 1, 2, 3, 4 | sticksstones4 43113 | . . 3 ⊢ (𝜑 → 𝐴 ≈ {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) |
| 6 | hasheni 14445 | . . 3 ⊢ (𝐴 ≈ {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾} → (♯‘𝐴) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) | |
| 7 | 5, 6 | syl 18 | . 2 ⊢ (𝜑 → (♯‘𝐴) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) |
| 8 | fzfid 14070 | . . . . 5 ⊢ (𝜑 → (1...𝑁) ∈ Fin) | |
| 9 | 2 | nn0zd 12673 | . . . . 5 ⊢ (𝜑 → 𝐾 ∈ ℤ) |
| 10 | hashbc 14551 | . . . . 5 ⊢ (((1...𝑁) ∈ Fin ∧ 𝐾 ∈ ℤ) → ((♯‘(1...𝑁))C𝐾) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) | |
| 11 | 8, 9, 10 | syl2anc 596 | . . . 4 ⊢ (𝜑 → ((♯‘(1...𝑁))C𝐾) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) |
| 12 | 11 | eqcomd 2766 | . . 3 ⊢ (𝜑 → (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) = ((♯‘(1...𝑁))C𝐾)) |
| 13 | hashfz1 14443 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (♯‘(1...𝑁)) = 𝑁) | |
| 14 | 1, 13 | syl 18 | . . . 4 ⊢ (𝜑 → (♯‘(1...𝑁)) = 𝑁) |
| 15 | 14 | oveq1d 7424 | . . 3 ⊢ (𝜑 → ((♯‘(1...𝑁))C𝐾) = (𝑁C𝐾)) |
| 16 | 12, 15 | eqtrd 2795 | . 2 ⊢ (𝜑 → (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) = (𝑁C𝐾)) |
| 17 | 7, 16 | eqtrd 2795 | 1 ⊢ (𝜑 → (♯‘𝐴) = (𝑁C𝐾)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 {cab 2738 ∀wral 3076 {crab 3412 𝒫 cpw 4557 class class class wbr 5103 ⟶wf 6524 ‘cfv 6528 (class class class)co 7409 ≈ cen 8949 Fincfn 8952 1c1 11158 < clt 11300 ℕ0cn0 12561 ℤcz 12648 ...cfz 13594 Ccbc 14399 ♯chash 14427 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-cnex 11213 ax-resscn 11214 ax-1cn 11215 ax-icn 11216 ax-addcl 11217 ax-addrcl 11218 ax-mulcl 11219 ax-mulrcl 11220 ax-mulcom 11221 ax-addass 11222 ax-mulass 11223 ax-distr 11224 ax-i2m1 11225 ax-1ne0 11226 ax-1rid 11227 ax-rnegex 11228 ax-rrecex 11229 ax-cnre 11230 ax-pre-lttri 11231 ax-pre-lttrn 11232 ax-pre-ltadd 11233 ax-pre-mulgt0 11234 ax-pre-sup 11235 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5543 df-eprel 5548 df-po 5556 df-so 5557 df-fr 5601 df-se 5602 df-we 5603 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-pred 6294 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-isom 6537 df-riota 7366 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7862 df-1st 7985 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8455 df-oadd 8459 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-sup 9412 df-inf 9413 df-oi 9482 df-dju 9939 df-card 9977 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-sub 11500 df-neg 11501 df-div 11929 df-nn 12291 df-n0 12562 df-z 12649 df-uz 12921 df-rp 13076 df-fz 13595 df-seq 14099 df-fac 14371 df-bc 14400 df-hash 14428 |
| This theorem is used by: sticksstones14 43124 |
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