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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 7884 | . 2 ⊢ (𝜑 → dom 𝐹 ∈ V) |
| 3 | hashdmpropge2.c | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ 𝑋) | |
| 4 | hashdmpropge2.d | . . . . 5 ⊢ (𝜑 → 𝐷 ∈ 𝑌) | |
| 5 | dmpropg 6202 | . . . . 5 ⊢ ((𝐶 ∈ 𝑋 ∧ 𝐷 ∈ 𝑌) → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} = {𝐴, 𝐵}) | |
| 6 | 3, 4, 5 | syl2anc 593 | . . . 4 ⊢ (𝜑 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} = {𝐴, 𝐵}) |
| 7 | hashdmpropge2.s | . . . . 5 ⊢ (𝜑 → {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ 𝐹) | |
| 8 | dmss 5878 | . . . . 5 ⊢ ({〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ 𝐹 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ dom 𝐹) | |
| 9 | 7, 8 | syl 17 | . . . 4 ⊢ (𝜑 → dom {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} ⊆ dom 𝐹) |
| 10 | 6, 9 | eqsstrrd 3971 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ dom 𝐹) |
| 11 | hashdmpropge2.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 12 | hashdmpropge2.b | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑊) | |
| 13 | prssg 4777 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ↔ {𝐴, 𝐵} ⊆ dom 𝐹)) | |
| 14 | 11, 12, 13 | syl2anc 593 | . . . 4 ⊢ (𝜑 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ↔ {𝐴, 𝐵} ⊆ dom 𝐹)) |
| 15 | hashdmpropge2.n | . . . . 5 ⊢ (𝜑 → 𝐴 ≠ 𝐵) | |
| 16 | neeq1 3019 | . . . . . . . 8 ⊢ (𝑎 = 𝐴 → (𝑎 ≠ 𝑏 ↔ 𝐴 ≠ 𝑏)) | |
| 17 | neeq2 3020 | . . . . . . . 8 ⊢ (𝑏 = 𝐵 → (𝐴 ≠ 𝑏 ↔ 𝐴 ≠ 𝐵)) | |
| 18 | 16, 17 | rspc2ev 3594 | . . . . . . 7 ⊢ ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹 ∧ 𝐴 ≠ 𝐵) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 19 | 18 | 3expa 1131 | . . . . . 6 ⊢ (((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) ∧ 𝐴 ≠ 𝐵) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 20 | 19 | expcom 417 | . . . . 5 ⊢ (𝐴 ≠ 𝐵 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 21 | 15, 20 | syl 17 | . . . 4 ⊢ (𝜑 → ((𝐴 ∈ dom 𝐹 ∧ 𝐵 ∈ dom 𝐹) → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 22 | 14, 21 | sylbird 262 | . . 3 ⊢ (𝜑 → ({𝐴, 𝐵} ⊆ dom 𝐹 → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏)) |
| 23 | 10, 22 | mpd 15 | . 2 ⊢ (𝜑 → ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) |
| 24 | hashge2el2difr 14494 | . 2 ⊢ ((dom 𝐹 ∈ V ∧ ∃𝑎 ∈ dom 𝐹∃𝑏 ∈ dom 𝐹 𝑎 ≠ 𝑏) → 2 ≤ (♯‘dom 𝐹)) | |
| 25 | 2, 23, 24 | syl2anc 593 | 1 ⊢ (𝜑 → 2 ≤ (♯‘dom 𝐹)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1560 ∈ wcel 2142 ≠ wne 2957 ∃wrex 3086 Vcvv 3454 ⊆ wss 3904 {cpr 4584 〈cop 4588 class class class wbr 5100 dom cdm 5647 ‘cfv 6521 ≤ cle 11217 2c2 12272 ♯chash 14343 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5246 ax-nul 5256 ax-pow 5322 ax-pr 5390 ax-un 7718 ax-cnex 11129 ax-resscn 11130 ax-1cn 11131 ax-icn 11132 ax-addcl 11133 ax-addrcl 11134 ax-mulcl 11135 ax-mulrcl 11136 ax-mulcom 11137 ax-addass 11138 ax-mulass 11139 ax-distr 11140 ax-i2m1 11141 ax-1ne0 11142 ax-1rid 11143 ax-rnegex 11144 ax-rrecex 11145 ax-cnre 11146 ax-pre-lttri 11147 ax-pre-lttrn 11148 ax-pre-ltadd 11149 ax-pre-mulgt0 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1099 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-nf 1804 df-sb 2091 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3368 df-rab 3415 df-v 3456 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4481 df-pw 4557 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4906 df-iun 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-1st 7970 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-1o 8437 df-oadd 8441 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-fin 8931 df-dju 9859 df-card 9897 df-pnf 11218 df-mnf 11219 df-xr 11220 df-ltxr 11221 df-le 11222 df-sub 11416 df-neg 11417 df-nn 12211 df-2 12280 df-n0 12482 df-xnn0 12555 df-z 12569 df-uz 12840 df-fz 13513 df-hash 14344 |
| This theorem is referenced by: structvtxvallem 29221 structgrssvtxlem 29224 |
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