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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 4659 | . . . 4 ⊢ ((𝐴 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ 𝐴) | |
| 2 | snfi 8960 | . . . . 5 ⊢ {𝐵} ∈ Fin | |
| 3 | hashun 14284 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ {𝐵} ∈ Fin ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) | |
| 4 | 2, 3 | mp3an2 1451 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) |
| 5 | 1, 4 | sylan2br 595 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + (♯‘{𝐵}))) |
| 6 | hashsng 14271 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → (♯‘{𝐵}) = 1) | |
| 7 | 6 | oveq2d 7357 | . . 3 ⊢ (𝐵 ∈ 𝑉 → ((♯‘𝐴) + (♯‘{𝐵})) = ((♯‘𝐴) + 1)) |
| 8 | 5, 7 | sylan9eq 2786 | . 2 ⊢ (((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝑉) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + 1)) |
| 9 | 8 | expcom 413 | 1 ⊢ (𝐵 ∈ 𝑉 → ((𝐴 ∈ Fin ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) + 1))) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ∪ cun 3895 ∩ cin 3896 ∅c0 4278 {csn 4571 ‘cfv 6476 (class class class)co 7341 Fincfn 8864 1c1 11002 + caddc 11004 ♯chash 14232 |
| 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 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5229 ax-nul 5239 ax-pow 5298 ax-pr 5365 ax-un 7663 ax-cnex 11057 ax-resscn 11058 ax-1cn 11059 ax-icn 11060 ax-addcl 11061 ax-addrcl 11062 ax-mulcl 11063 ax-mulrcl 11064 ax-mulcom 11065 ax-addass 11066 ax-mulass 11067 ax-distr 11068 ax-i2m1 11069 ax-1ne0 11070 ax-1rid 11071 ax-rnegex 11072 ax-rrecex 11073 ax-cnre 11074 ax-pre-lttri 11075 ax-pre-lttrn 11076 ax-pre-ltadd 11077 ax-pre-mulgt0 11078 |
| 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 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4279 df-if 4471 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-uni 4855 df-int 4893 df-iun 4938 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5506 df-eprel 5511 df-po 5519 df-so 5520 df-fr 5564 df-we 5566 df-xp 5617 df-rel 5618 df-cnv 5619 df-co 5620 df-dm 5621 df-rn 5622 df-res 5623 df-ima 5624 df-pred 6243 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-riota 7298 df-ov 7344 df-oprab 7345 df-mpo 7346 df-om 7792 df-1st 7916 df-2nd 7917 df-frecs 8206 df-wrecs 8237 df-recs 8286 df-rdg 8324 df-1o 8380 df-oadd 8384 df-er 8617 df-en 8865 df-dom 8866 df-sdom 8867 df-fin 8868 df-dju 9789 df-card 9827 df-pnf 11143 df-mnf 11144 df-xr 11145 df-ltxr 11146 df-le 11147 df-sub 11341 df-neg 11342 df-nn 12121 df-n0 12377 df-z 12464 df-uz 12728 df-fz 13403 df-hash 14233 |
| This theorem is referenced by: hashprg 14297 hashp1i 14305 hashxplem 14335 hashmap 14337 hashf1lem2 14358 hashf1 14359 hashtpg 14387 incexclem 15738 sumodd 16294 vdwlem6 16893 ramub1lem1 16933 ramub1lem2 16934 ppiprm 27083 wlkp1lem2 29646 ballotlemfp1 34497 erdszelem8 35234 poimirlem25 37685 |
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