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| Mirrors > Home > MPE Home > Th. List > fz1f1o | Structured version Visualization version GIF version | ||
| Description: A lemma for working with finite sums. (Contributed by Mario Carneiro, 22-Apr-2014.) |
| Ref | Expression |
|---|---|
| fz1f1o | ⊢ (𝐴 ∈ Fin → (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashcl 14467 | . . . 4 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ0) | |
| 2 | elnn0 12577 | . . . 4 ⊢ ((♯‘𝐴) ∈ ℕ0 ↔ ((♯‘𝐴) ∈ ℕ ∨ (♯‘𝐴) = 0)) | |
| 3 | 1, 2 | sylib 221 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) ∈ ℕ ∨ (♯‘𝐴) = 0)) |
| 4 | 3 | orcomd 885 | . 2 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) = 0 ∨ (♯‘𝐴) ∈ ℕ)) |
| 5 | hasheq0 14474 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) = 0 ↔ 𝐴 = ∅)) | |
| 6 | isfinite4 14473 | . . . . 5 ⊢ (𝐴 ∈ Fin ↔ (1...(♯‘𝐴)) ≈ 𝐴) | |
| 7 | bren 8961 | . . . . 5 ⊢ ((1...(♯‘𝐴)) ≈ 𝐴 ↔ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴) | |
| 8 | 6, 7 | sylbb 222 | . . . 4 ⊢ (𝐴 ∈ Fin → ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴) |
| 9 | 8 | biantrud 541 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) ∈ ℕ ↔ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴))) |
| 10 | 5, 9 | orbi12d 932 | . 2 ⊢ (𝐴 ∈ Fin → (((♯‘𝐴) = 0 ∨ (♯‘𝐴) ∈ ℕ) ↔ (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴)))) |
| 11 | 4, 10 | mpbid 235 | 1 ⊢ (𝐴 ∈ Fin → (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∨ wo 861 = wceq 1570 ∃wex 1812 ∈ wcel 2145 ∅c0 4278 class class class wbr 5102 –1-1-onto→wf1o 6526 ‘cfv 6527 (class class class)co 7408 ≈ cen 8948 Fincfn 8951 0cc0 11171 1c1 11172 ℕcn 12304 ℕ0cn0 12575 ...cfz 13608 ♯chash 14441 |
| 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-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 ax-cnex 11227 ax-resscn 11228 ax-1cn 11229 ax-icn 11230 ax-addcl 11231 ax-addrcl 11232 ax-mulcl 11233 ax-mulrcl 11234 ax-mulcom 11235 ax-addass 11236 ax-mulass 11237 ax-distr 11238 ax-i2m1 11239 ax-1ne0 11240 ax-1rid 11241 ax-rnegex 11242 ax-rrecex 11243 ax-cnre 11244 ax-pre-lttri 11245 ax-pre-lttrn 11246 ax-pre-ltadd 11247 ax-pre-mulgt0 11248 |
| 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-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-ord 6354 df-on 6355 df-lim 6356 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7861 df-1st 7984 df-2nd 7985 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-1o 8454 df-er 8695 df-en 8952 df-dom 8953 df-sdom 8954 df-fin 8955 df-card 9991 df-pnf 11316 df-mnf 11317 df-xr 11318 df-ltxr 11319 df-le 11320 df-sub 11514 df-neg 11515 df-nn 12305 df-n0 12576 df-z 12663 df-uz 12935 df-fz 13609 df-hash 14442 |
| This theorem is used by: sumz 15855 fsumf1o 15856 fsumss 15858 fsumcl2lem 15864 fsumadd 15873 fsummulc2 15917 fsumconst 15923 fsumrelem 15941 prod1 16078 fprodf1o 16080 fprodss 16082 fprodcl2lem 16084 fprodmul 16094 fproddiv 16095 fprodconst 16112 fprodn0 16113 gsumval3eu 20079 gsumzres 20084 gsumzcl2 20085 gsumzf1o 20087 gsumzaddlem 20096 gsumconst 20109 gsumzmhm 20112 gsumzoppg 20119 gsumfsum 21701 f1ocnt 33325 stoweidlem35 46967 stoweidlem39 46971 |
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