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| Mirrors > Home > MPE Home > Th. List > hashbnd | Structured version Visualization version GIF version | ||
| Description: If 𝐴 has size bounded by an integer 𝐵, then 𝐴 is finite. (Contributed by Mario Carneiro, 14-Jun-2015.) |
| Ref | Expression |
|---|---|
| hashbnd | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0 ∧ (♯‘𝐴) ≤ 𝐵) → 𝐴 ∈ Fin) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nn0re 12410 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ0 → 𝐵 ∈ ℝ) | |
| 2 | ltpnf 13034 | . . . . . . . 8 ⊢ (𝐵 ∈ ℝ → 𝐵 < +∞) | |
| 3 | rexr 11178 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 4 | pnfxr 11186 | . . . . . . . . 9 ⊢ +∞ ∈ ℝ* | |
| 5 | xrltnle 11199 | . . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝐵 < +∞ ↔ ¬ +∞ ≤ 𝐵)) | |
| 6 | 3, 4, 5 | sylancl 586 | . . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵 < +∞ ↔ ¬ +∞ ≤ 𝐵)) |
| 7 | 2, 6 | mpbid 232 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ → ¬ +∞ ≤ 𝐵) |
| 8 | 1, 7 | syl 17 | . . . . . 6 ⊢ (𝐵 ∈ ℕ0 → ¬ +∞ ≤ 𝐵) |
| 9 | hashinf 14258 | . . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → (♯‘𝐴) = +∞) | |
| 10 | 9 | breq1d 5108 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → ((♯‘𝐴) ≤ 𝐵 ↔ +∞ ≤ 𝐵)) |
| 11 | 10 | notbid 318 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → (¬ (♯‘𝐴) ≤ 𝐵 ↔ ¬ +∞ ≤ 𝐵)) |
| 12 | 8, 11 | syl5ibrcom 247 | . . . . 5 ⊢ (𝐵 ∈ ℕ0 → ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 13 | 12 | expdimp 452 | . . . 4 ⊢ ((𝐵 ∈ ℕ0 ∧ 𝐴 ∈ 𝑉) → (¬ 𝐴 ∈ Fin → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 14 | 13 | ancoms 458 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0) → (¬ 𝐴 ∈ Fin → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 15 | 14 | con4d 115 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0) → ((♯‘𝐴) ≤ 𝐵 → 𝐴 ∈ Fin)) |
| 16 | 15 | 3impia 1117 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0 ∧ (♯‘𝐴) ≤ 𝐵) → 𝐴 ∈ Fin) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 ∈ wcel 2113 class class class wbr 5098 ‘cfv 6492 Fincfn 8883 ℝcr 11025 +∞cpnf 11163 ℝ*cxr 11165 < clt 11166 ≤ cle 11167 ℕ0cn0 12401 ♯chash 14253 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-1o 8397 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-fin 8887 df-card 9851 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367 df-nn 12146 df-n0 12402 df-z 12489 df-uz 12752 df-hash 14254 |
| This theorem is referenced by: 0ringnnzr 20458 fta1glem2 26130 fta1blem 26132 lgsqrlem4 27316 fusgredgfi 29398 aks6d1c2lem4 42377 idomsubgmo 43431 pgrple2abl 48607 |
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