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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 2737 | . . . 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 42606 | . . 3 ⊢ (𝜑 → 𝐴 ≈ {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) |
| 6 | hasheni 14305 | . . 3 ⊢ (𝐴 ≈ {𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾} → (♯‘𝐴) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) | |
| 7 | 5, 6 | syl 17 | . 2 ⊢ (𝜑 → (♯‘𝐴) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) |
| 8 | fzfid 13930 | . . . . 5 ⊢ (𝜑 → (1...𝑁) ∈ Fin) | |
| 9 | 2 | nn0zd 12544 | . . . . 5 ⊢ (𝜑 → 𝐾 ∈ ℤ) |
| 10 | hashbc 14410 | . . . . 5 ⊢ (((1...𝑁) ∈ Fin ∧ 𝐾 ∈ ℤ) → ((♯‘(1...𝑁))C𝐾) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) | |
| 11 | 8, 9, 10 | syl2anc 585 | . . . 4 ⊢ (𝜑 → ((♯‘(1...𝑁))C𝐾) = (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾})) |
| 12 | 11 | eqcomd 2743 | . . 3 ⊢ (𝜑 → (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) = ((♯‘(1...𝑁))C𝐾)) |
| 13 | hashfz1 14303 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (♯‘(1...𝑁)) = 𝑁) | |
| 14 | 1, 13 | syl 17 | . . . 4 ⊢ (𝜑 → (♯‘(1...𝑁)) = 𝑁) |
| 15 | 14 | oveq1d 7377 | . . 3 ⊢ (𝜑 → ((♯‘(1...𝑁))C𝐾) = (𝑁C𝐾)) |
| 16 | 12, 15 | eqtrd 2772 | . 2 ⊢ (𝜑 → (♯‘{𝑠 ∈ 𝒫 (1...𝑁) ∣ (♯‘𝑠) = 𝐾}) = (𝑁C𝐾)) |
| 17 | 7, 16 | eqtrd 2772 | 1 ⊢ (𝜑 → (♯‘𝐴) = (𝑁C𝐾)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 {cab 2715 ∀wral 3052 {crab 3390 𝒫 cpw 4542 class class class wbr 5086 ⟶wf 6490 ‘cfv 6494 (class class class)co 7362 ≈ cen 8885 Fincfn 8888 1c1 11034 < clt 11174 ℕ0cn0 12432 ℤcz 12519 ...cfz 13456 Ccbc 14259 ♯chash 14287 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5213 ax-sep 5232 ax-nul 5242 ax-pow 5304 ax-pr 5372 ax-un 7684 ax-cnex 11089 ax-resscn 11090 ax-1cn 11091 ax-icn 11092 ax-addcl 11093 ax-addrcl 11094 ax-mulcl 11095 ax-mulrcl 11096 ax-mulcom 11097 ax-addass 11098 ax-mulass 11099 ax-distr 11100 ax-i2m1 11101 ax-1ne0 11102 ax-1rid 11103 ax-rnegex 11104 ax-rrecex 11105 ax-cnre 11106 ax-pre-lttri 11107 ax-pre-lttrn 11108 ax-pre-ltadd 11109 ax-pre-mulgt0 11110 ax-pre-sup 11111 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5521 df-eprel 5526 df-po 5534 df-so 5535 df-fr 5579 df-se 5580 df-we 5581 df-xp 5632 df-rel 5633 df-cnv 5634 df-co 5635 df-dm 5636 df-rn 5637 df-res 5638 df-ima 5639 df-pred 6261 df-ord 6322 df-on 6323 df-lim 6324 df-suc 6325 df-iota 6450 df-fun 6496 df-fn 6497 df-f 6498 df-f1 6499 df-fo 6500 df-f1o 6501 df-fv 6502 df-isom 6503 df-riota 7319 df-ov 7365 df-oprab 7366 df-mpo 7367 df-om 7813 df-1st 7937 df-2nd 7938 df-frecs 8226 df-wrecs 8257 df-recs 8306 df-rdg 8344 df-1o 8400 df-oadd 8404 df-er 8638 df-en 8889 df-dom 8890 df-sdom 8891 df-fin 8892 df-sup 9350 df-inf 9351 df-oi 9420 df-dju 9820 df-card 9858 df-pnf 11176 df-mnf 11177 df-xr 11178 df-ltxr 11179 df-le 11180 df-sub 11374 df-neg 11375 df-div 11803 df-nn 12170 df-n0 12433 df-z 12520 df-uz 12784 df-rp 12938 df-fz 13457 df-seq 13959 df-fac 14231 df-bc 14260 df-hash 14288 |
| This theorem is referenced by: sticksstones14 42617 |
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