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| Mirrors > Home > MPE Home > Th. List > hashunsng | Structured version Visualization version GIF version | ||
| Description: The size of the union of a finite set with a disjoint singleton is one more than the size of the set. (Contributed by Paul Chapman, 30-Nov-2012.) |
| Ref | Expression |
|---|---|
| hashunsng | ⊢ (𝐵 ∈ 𝑉 → ((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + 1))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | disjsn 4679 | . . . 4 ⊢ ((𝐴 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ 𝐴) | |
| 2 | snfi 9043 | . . . . 5 ⊢ {𝐵} ∈ Fin | |
| 3 | hashun 14431 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ {𝐵} ∈ Fin ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) | |
| 4 | 2, 3 | mp3an2 1478 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) |
| 5 | 1, 4 | sylan2br 607 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) |
| 6 | hashsng 14418 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → (♯‘{𝐵}) = 1) | |
| 7 | 6 | oveq2d 7432 | . . 3 ⊢ (𝐵 ∈ 𝑉 → ((♯‘𝐴) + (♯‘{𝐵})) = ((♯‘𝐴) + 1)) |
| 8 | 5, 7 | sylan9eq 2820 | . 2 ⊢ (((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝑉) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + 1)) |
| 9 | 8 | expcom 419 | 1 ⊢ (𝐵 ∈ 𝑉 → ((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + 1))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2146 ∪ cun 3904 ∩ cin 3905 ∅c0 4286 {csn 4591 ‘cfv 6540 (class class class)co 7416 Fincfn 8945 1c1 11112 + caddc 11114 ♯chash 14379 |
| 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 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-cnex 11167 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-oadd 8459 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-dju 9899 df-card 9937 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 df-nn 12245 df-n0 12516 df-z 12603 df-uz 12874 df-fz 13547 df-hash 14380 |
| This theorem is used by: hashprg 14444 hashp1i 14452 hashxplem 14483 hashmap 14485 hashf1lem2 14506 hashf1 14507 hashtpg 14535 incexclem 15908 sumodd 16463 vdwlem6 17063 ramub1lem1 17103 ramub1lem2 17104 ppiprm 27344 wlkp1lem2 30051 esplyind 33988 esplyindfv 33989 ballotlemfp1 34906 erdszelem8 35703 poimirlem25 38329 |
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