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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 12531 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ0 → 𝐵 ∈ ℝ) | |
| 2 | ltpnf 13163 | . . . . . . . 8 ⊢ (𝐵 ∈ ℝ → 𝐵 < +∞) | |
| 3 | rexr 11273 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 4 | pnfxr 11281 | . . . . . . . . 9 ⊢ +∞ ∈ ℝ* | |
| 5 | xrltnle 11294 | . . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝐵 < +∞ ↔ ¬ +∞ ≤ 𝐵)) | |
| 6 | 3, 4, 5 | sylancl 598 | . . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵 < +∞ ↔ ¬ +∞ ≤ 𝐵)) |
| 7 | 2, 6 | mpbid 235 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ → ¬ +∞ ≤ 𝐵) |
| 8 | 1, 7 | syl 18 | . . . . . 6 ⊢ (𝐵 ∈ ℕ0 → ¬ +∞ ≤ 𝐵) |
| 9 | hashinf 14391 | . . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → (♯‘𝐴) = +∞) | |
| 10 | 9 | breq1d 5124 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → ((♯‘𝐴) ≤ 𝐵 ↔ +∞ ≤ 𝐵)) |
| 11 | 10 | notbid 321 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → (¬ (♯‘𝐴) ≤ 𝐵 ↔ ¬ +∞ ≤ 𝐵)) |
| 12 | 8, 11 | syl5ibrcom 250 | . . . . 5 ⊢ (𝐵 ∈ ℕ0 → ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 13 | 12 | expdimp 458 | . . . 4 ⊢ ((𝐵 ∈ ℕ0 ∧ 𝐴 ∈ 𝑉) → (¬ 𝐴 ∈ Fin → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 14 | 13 | ancoms 464 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0) → (¬ 𝐴 ∈ Fin → ¬ (♯‘𝐴) ≤ 𝐵)) |
| 15 | 14 | con4d 116 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0) → ((♯‘𝐴) ≤ 𝐵 → 𝐴 ∈ Fin)) |
| 16 | 15 | 3impia 1135 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ ℕ0 ∧ (♯‘𝐴) ≤ 𝐵) → 𝐴 ∈ Fin) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 ∈ wcel 2146 class class class wbr 5114 ‘cfv 6543 Fincfn 8952 ℝcr 11117 +∞cpnf 11258 ℝ*cxr 11260 < clt 11261 ≤ cle 11262 ℕ0cn0 12522 ♯chash 14386 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 ax-cnex 11174 ax-resscn 11175 ax-1cn 11176 ax-icn 11177 ax-addcl 11178 ax-addrcl 11179 ax-mulcl 11180 ax-mulrcl 11181 ax-mulcom 11182 ax-addass 11183 ax-mulass 11184 ax-distr 11185 ax-i2m1 11186 ax-1ne0 11187 ax-1rid 11188 ax-rnegex 11189 ax-rrecex 11190 ax-cnre 11191 ax-pre-lttri 11192 ax-pre-lttrn 11193 ax-pre-ltadd 11194 ax-pre-mulgt0 11195 |
| 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 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-int 4918 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7380 df-ov 7426 df-oprab 7427 df-mpo 7428 df-om 7872 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8703 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-card 9944 df-pnf 11263 df-mnf 11264 df-xr 11265 df-ltxr 11266 df-le 11267 df-sub 11461 df-neg 11462 df-nn 12252 df-n0 12523 df-z 12610 df-uz 12881 df-hash 14387 |
| This theorem is used by: 0ringnnzr 20660 fta1glem2 26363 fta1blem 26365 lgsqrlem4 27550 fusgredgfi 29712 aks6d1c2lem4 42935 idomsubgmo 43961 pgrple2abl 49186 |
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