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| Mirrors > Home > MPE Home > Th. List > Mathboxes > 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 482 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐴 ∈ Fin) | |
| 2 | simpr 484 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ⊊ 𝐴) | |
| 3 | 2 | pssssd 4052 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ⊆ 𝐴) |
| 4 | 1, 3 | ssexd 5269 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → 𝐵 ∈ V) |
| 5 | hashxrcl 14280 | . . 3 ⊢ (𝐵 ∈ V → (♯‘𝐵) ∈ ℝ*) | |
| 6 | 4, 5 | syl 17 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) ∈ ℝ*) |
| 7 | hashxrcl 14280 | . . 3 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℝ*) | |
| 8 | 7 | adantr 480 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐴) ∈ ℝ*) |
| 9 | hashss 14332 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊆ 𝐴) → (♯‘𝐵) ≤ (♯‘𝐴)) | |
| 10 | 3, 9 | syldan 591 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) ≤ (♯‘𝐴)) |
| 11 | 1 | adantr 480 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ∈ Fin) |
| 12 | 3 | adantr 480 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ⊆ 𝐴) |
| 13 | 11, 12 | ssfid 9169 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ∈ Fin) |
| 14 | simpr 484 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → (♯‘𝐴) = (♯‘𝐵)) | |
| 15 | hashen 14270 | . . . . . . . 8 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘𝐴) = (♯‘𝐵) ↔ 𝐴 ≈ 𝐵)) | |
| 16 | 15 | biimpa 476 | . . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ≈ 𝐵) |
| 17 | 11, 13, 14, 16 | syl21anc 837 | . . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐴 ≈ 𝐵) |
| 18 | 17 | ensymd 8942 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ≈ 𝐴) |
| 19 | fisseneq 9163 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊆ 𝐴 ∧ 𝐵 ≈ 𝐴) → 𝐵 = 𝐴) | |
| 20 | 11, 12, 18, 19 | syl3anc 1373 | . . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 = 𝐴) |
| 21 | 2 | adantr 480 | . . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ⊊ 𝐴) |
| 22 | 21 | pssned 4053 | . . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → 𝐵 ≠ 𝐴) |
| 23 | 22 | neneqd 2937 | . . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) ∧ (♯‘𝐴) = (♯‘𝐵)) → ¬ 𝐵 = 𝐴) |
| 24 | 20, 23 | pm2.65da 816 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → ¬ (♯‘𝐴) = (♯‘𝐵)) |
| 25 | 24 | neqned 2939 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐴) ≠ (♯‘𝐵)) |
| 26 | xrltlen 13060 | . . 3 ⊢ (((♯‘𝐵) ∈ ℝ* ∧ (♯‘𝐴) ∈ ℝ*) → ((♯‘𝐵) < (♯‘𝐴) ↔ ((♯‘𝐵) ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ (♯‘𝐵)))) | |
| 27 | 26 | biimpar 477 | . 2 ⊢ ((((♯‘𝐵) ∈ ℝ* ∧ (♯‘𝐴) ∈ ℝ*) ∧ ((♯‘𝐵) ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ (♯‘𝐵))) → (♯‘𝐵) < (♯‘𝐴)) |
| 28 | 6, 8, 10, 25, 27 | syl22anc 838 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ⊊ 𝐴) → (♯‘𝐵) < (♯‘𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ≠ wne 2932 Vcvv 3440 ⊆ wss 3901 ⊊ wpss 3902 class class class wbr 5098 ‘cfv 6492 ≈ cen 8880 Fincfn 8883 ℝ*cxr 11165 < clt 11166 ≤ cle 11167 ♯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-1st 7933 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-1o 8397 df-oadd 8401 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-xnn0 12475 df-z 12489 df-uz 12752 df-fz 13424 df-hash 14254 |
| This theorem is referenced by: exsslsb 33753 |
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