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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 14371 | . . . 4 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ0) | |
| 2 | elnn0 12485 | . . . 4 ⊢ ((♯‘𝐴) ∈ ℕ0 ↔ ((♯‘𝐴) ∈ ℕ ∨ (♯‘𝐴) = 0)) | |
| 3 | 1, 2 | sylib 220 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) ∈ ℕ ∨ (♯‘𝐴) = 0)) |
| 4 | 3 | orcomd 882 | . 2 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) = 0 ∨ (♯‘𝐴) ∈ ℕ)) |
| 5 | hasheq0 14378 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) = 0 ↔ 𝐴 = ∅)) | |
| 6 | isfinite4 14377 | . . . . 5 ⊢ (𝐴 ∈ Fin ↔ (1...(♯‘𝐴)) ≈ 𝐴) | |
| 7 | bren 8939 | . . . . 5 ⊢ ((1...(♯‘𝐴)) ≈ 𝐴 ↔ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴) | |
| 8 | 6, 7 | sylbb 221 | . . . 4 ⊢ (𝐴 ∈ Fin → ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴) |
| 9 | 8 | biantrud 539 | . . 3 ⊢ (𝐴 ∈ Fin → ((♯‘𝐴) ∈ ℕ ↔ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴))) |
| 10 | 5, 9 | orbi12d 929 | . 2 ⊢ (𝐴 ∈ Fin → (((♯‘𝐴) = 0 ∨ (♯‘𝐴) ∈ ℕ) ↔ (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴)))) |
| 11 | 4, 10 | mpbid 234 | 1 ⊢ (𝐴 ∈ Fin → (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto→𝐴))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 ∨ wo 858 = wceq 1562 ∃wex 1801 ∈ wcel 2144 ∅c0 4287 class class class wbr 5102 –1-1-onto→wf1o 6522 ‘cfv 6523 (class class class)co 7398 ≈ cen 8926 Fincfn 8929 0cc0 11075 1c1 11076 ℕcn 12212 ℕ0cn0 12483 ...cfz 13514 ♯chash 14345 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 ax-cnex 11131 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 ax-pre-mulgt0 11152 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 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 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5544 df-eprel 5549 df-po 5557 df-so 5558 df-fr 5602 df-we 5604 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-pred 6290 df-ord 6351 df-on 6352 df-lim 6353 df-suc 6354 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-riota 7355 df-ov 7401 df-oprab 7402 df-mpo 7403 df-om 7849 df-1st 7972 df-2nd 7973 df-frecs 8264 df-wrecs 8295 df-recs 8344 df-rdg 8383 df-1o 8439 df-er 8680 df-en 8930 df-dom 8931 df-sdom 8932 df-fin 8933 df-card 9899 df-pnf 11220 df-mnf 11221 df-xr 11222 df-ltxr 11223 df-le 11224 df-sub 11418 df-neg 11419 df-nn 12213 df-n0 12484 df-z 12571 df-uz 12842 df-fz 13515 df-hash 14346 |
| This theorem is referenced by: sumz 15751 fsumf1o 15752 fsumss 15754 fsumcl2lem 15760 fsumadd 15769 fsummulc2 15813 fsumconst 15819 fsumrelem 15837 prod1 15976 fprodf1o 15978 fprodss 15980 fprodcl2lem 15982 fprodmul 15992 fproddiv 15993 fprodconst 16010 fprodn0 16011 gsumval3eu 19946 gsumzres 19951 gsumzcl2 19952 gsumzf1o 19954 gsumzaddlem 19963 gsumconst 19976 gsumzmhm 19979 gsumzoppg 19986 gsumfsum 21488 f1ocnt 33004 stoweidlem35 46614 stoweidlem39 46618 |
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