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| Mirrors > Home > MPE Home > Th. List > hashdmpropge2 | Structured version Visualization version GIF version | ||
| Description: The size of the domain of a class which contains two ordered pairs with different first components is greater than or equal to 2. (Contributed by AV, 12-Nov-2021.) |
| Ref | Expression |
|---|---|
| hashdmpropge2.a | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
| hashdmpropge2.b | ⊢ (𝜑 → 𝐵 ∈ 𝑊) |
| hashdmpropge2.c | ⊢ (𝜑 → 𝐶 ∈ 𝑋) |
| hashdmpropge2.d | ⊢ (𝜑 → 𝐷 ∈ 𝑌) |
| hashdmpropge2.f | ⊢ (𝜑 → 𝐹 ∈ 𝑍) |
| hashdmpropge2.n | ⊢ (𝜑 → 𝐴 ≠ 𝐵) |
| hashdmpropge2.s | ⊢ (𝜑 → {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ 𝐹) |
| Ref | Expression |
|---|---|
| hashdmpropge2 | ⊢ (𝜑 → 2 ≤ (♯‘dom 𝐹)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashdmpropge2.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ 𝑍) | |
| 2 | 1 | dmexd 7900 | . 2 ⊢ (𝜑 → dom 𝐹 ∈ V) |
| 3 | hashdmpropge2.c | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ 𝑋) | |
| 4 | hashdmpropge2.d | . . . . 5 ⊢ (𝜑 → 𝐷 ∈ 𝑌) | |
| 5 | dmpropg 6217 | . . . . 5 ⊢ ((𝐶 ∈ 𝑋 ∧ 𝐷 ∈ 𝑌) → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} = {𝐴, 𝐵}) | |
| 6 | 3, 4, 5 | syl2anc 595 | . . . 4 ⊢ (𝜑 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} = {𝐴, 𝐵}) |
| 7 | hashdmpropge2.s | . . . . 5 ⊢ (𝜑 → {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ 𝐹) | |
| 8 | dmss 5893 | . . . . 5 ⊢ ({〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ 𝐹 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ dom 𝐹) | |
| 9 | 7, 8 | syl 18 | . . . 4 ⊢ (𝜑 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ dom 𝐹) |
| 10 | 6, 9 | eqsstrrd 3980 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ dom 𝐹) |
| 11 | hashdmpropge2.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 12 | hashdmpropge2.b | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑊) | |
| 13 | prssg 4789 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ↔ {𝐴, 𝐵} ⊆ dom 𝐹)) | |
| 14 | 11, 12, 13 | syl2anc 595 | . . . 4 ⊢ (𝜑 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ↔ {𝐴, 𝐵} ⊆ dom 𝐹)) |
| 15 | hashdmpropge2.n | . . . . 5 ⊢ (𝜑 → 𝐴 ≠ 𝐵) | |
| 16 | neeq1 3026 | . . . . . . . 8 ⊢ (𝑎 = 𝐴 → (𝑎 ≠ 𝑏 ↔ 𝐴 ≠ 𝑏)) | |
| 17 | neeq2 3027 | . . . . . . . 8 ⊢ (𝑏 = 𝐵 → (𝐴 ≠ 𝑏 ↔ 𝐴 ≠ 𝐵)) | |
| 18 | 16, 17 | rspc2ev 3603 | . . . . . . 7 ⊢ ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹 ∧ 𝐴 ≠ 𝐵) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 19 | 18 | 3expa 1134 | . . . . . 6 ⊢ (((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ∧ 𝐴 ≠ 𝐵) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 20 | 19 | expcom 418 | . . . . 5 ⊢ (𝐴 ≠ 𝐵 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 21 | 15, 20 | syl 18 | . . . 4 ⊢ (𝜑 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 22 | 14, 21 | sylbird 263 | . . 3 ⊢ (𝜑 → ({𝐴, 𝐵} ⊆ dom 𝐹 → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 23 | 10, 22 | mpd 16 | . 2 ⊢ (𝜑 → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 24 | hashge2el2difr 14518 | . 2 ⊢ ((dom 𝐹 ∈ V ∧ ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) → 2 ≤ (♯‘dom 𝐹)) | |
| 25 | 2, 23, 24 | syl2anc 595 | 1 ⊢ (𝜑 → 2 ≤ (♯‘dom 𝐹)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1567 ∈ wcel 2149 ≠ wne 2964 ∃wrex 3095 Vcvv 3463 ⊆ wss 3913 {cpr 4596 〈cop 4600 class class class wbr 5113 dom cdm 5662 ‘cfv 6537 ≤ cle 11244 2c2 12295 ♯chash 14366 |
| 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 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 |
| 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 7863 df-1st 7986 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8453 df-oadd 8457 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-dju 9887 df-card 9925 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-nn 12234 df-2 12303 df-n0 12505 df-xnn0 12578 df-z 12592 df-uz 12863 df-fz 13536 df-hash 14367 |
| This theorem is referenced by: structvtxvallem 29311 structgrssvtxlem 29314 |
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