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| Mirrors > Home > MPE Home > Th. List > hashpss | Structured version Visualization version GIF version | ||
| Description: The size of a proper subset is less than the size of its finite superset. (Contributed by Thierry Arnoux, 13-Oct-2025.) |
| Ref | Expression |
|---|---|
| hashpss | ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) < (♯‘𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 487 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐴 ∈ Fin) | |
| 2 | simpr 489 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ⊊ 𝐴) | |
| 3 | 2 | pssssd 4062 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ⊆ 𝐴) |
| 4 | 1, 3 | ssexd 5295 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ∈ V) |
| 5 | hashxrcl 14392 | . . 3 ⊢ (𝐵 ∈ V → (♯‘𝐵) ∈ ℝ*) | |
| 6 | 4, 5 | syl 18 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) ∈ ℝ*) |
| 7 | hashxrcl 14392 | . . 3 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℝ*) | |
| 8 | 7 | adantr 485 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐴) ∈ ℝ*) |
| 9 | hashss 14444 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊆ 𝐴) → (♯‘𝐵) ≤ (♯‘𝐴)) | |
| 10 | 3, 9 | syldan 602 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) ≤ (♯‘𝐴)) |
| 11 | 1 | adantr 485 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ∈ Fin) |
| 12 | 3 | adantr 485 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ⊆ 𝐴) |
| 13 | 11, 12 | ssfid 9228 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ∈ Fin) |
| 14 | simpr 489 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → (♯‘𝐴) = (♯‘𝐵)) | |
| 15 | hashen 14382 | . . . . . . . 8 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘𝐴) = (♯‘𝐵) ↔ 𝐴 ≈ 𝐵)) | |
| 16 | 15 | biimpa 481 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ≈ 𝐵) |
| 17 | 11, 13, 14, 16 | syl21anc 850 | . . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ≈ 𝐵) |
| 18 | 17 | ensymd 9001 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ≈ 𝐴) |
| 19 | fisseneq 9222 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊆ 𝐴 ∧ 𝐵 ≈ 𝐴) → 𝐵 = 𝐴) | |
| 20 | 11, 12, 18, 19 | syl3anc 1396 | . . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 = 𝐴) |
| 21 | 2 | adantr 485 | . . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ⊊ 𝐴) |
| 22 | 21 | pssned 4063 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ≠ 𝐴) |
| 23 | 22 | neneqd 2969 | . . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → ¬ 𝐵 = 𝐴) |
| 24 | 20, 23 | pm2.65da 828 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → ¬ (♯‘𝐴) = (♯‘𝐵)) |
| 25 | 24 | neqned 2971 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐴) ≠ (♯‘𝐵)) |
| 26 | xrltlen 13170 | . . 3 ⊢ (((♯‘𝐵) ∈ ℝ* ∧ (♯‘𝐴) ∈ ℝ*) → ((♯‘𝐵) < (♯‘𝐴) ↔ ((♯‘𝐵) ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ (♯‘𝐵)))) | |
| 27 | 26 | biimpar 482 | . 2 ⊢ ((((♯‘𝐵) ∈ ℝ* ∧ (♯‘𝐴) ∈ ℝ*) ∧ ((♯‘𝐵) ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ (♯‘𝐵))) → (♯‘𝐵) < (♯‘𝐴)) |
| 28 | 6, 8, 10, 25, 27 | syl22anc 851 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) < (♯‘𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1567 ∈ wcel 2149 ≠ wne 2964 Vcvv 3463 ⊆ wss 3913 ⊊ wpss 3914 class class class wbr 5113 ‘cfv 6537 ≈ cen 8939 Fincfn 8942 ℝ*cxr 11241 < clt 11242 ≤ cle 11243 ♯chash 14365 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11155 ax-resscn 11156 ax-1cn 11157 ax-icn 11158 ax-addcl 11159 ax-addrcl 11160 ax-mulcl 11161 ax-mulrcl 11162 ax-mulcom 11163 ax-addass 11164 ax-mulass 11165 ax-distr 11166 ax-i2m1 11167 ax-1ne0 11168 ax-1rid 11169 ax-rnegex 11170 ax-rrecex 11171 ax-cnre 11172 ax-pre-lttri 11173 ax-pre-lttrn 11174 ax-pre-ltadd 11175 ax-pre-mulgt0 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-int 4917 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7862 df-1st 7985 df-2nd 7986 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-1o 8452 df-oadd 8456 df-er 8693 df-en 8943 df-dom 8944 df-sdom 8945 df-fin 8946 df-card 9924 df-pnf 11244 df-mnf 11245 df-xr 11246 df-ltxr 11247 df-le 11248 df-sub 11442 df-neg 11443 df-nn 12233 df-n0 12504 df-xnn0 12577 df-z 12591 df-uz 12862 df-fz 13535 df-hash 14366 |
| This theorem is referenced by: exsslsb 33931 hashnnlt 45622 |
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