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| Mirrors > Home > MPE Home > Th. List > hashunsngx | Structured version Visualization version GIF version | ||
| Description: The size of the union of a set with a disjoint singleton is the extended real addition of the size of the set and 1, analogous to hashunsng 14575. (Contributed by BTernaryTau, 9-Sep-2023.) |
| Ref | Expression |
|---|---|
| hashunsngx | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (¬ 𝐵 ∈ 𝐴 → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e 1))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | disjsn 4672 | . . . . 5 ⊢ ((𝐴 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ 𝐴) | |
| 2 | snfi 9107 | . . . . . 6 ⊢ {𝐵} ∈ Fin | |
| 3 | hashunx 14569 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ {𝐵} ∈ Fin ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e (♯‘{𝐵}))) | |
| 4 | 2, 3 | mp3an2 1479 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝐴 ∩ {𝐵}) = ∅) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e (♯‘{𝐵}))) |
| 5 | 1, 4 | sylan2br 607 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e (♯‘{𝐵}))) |
| 6 | 5 | 3adant2 1149 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e (♯‘{𝐵}))) |
| 7 | hashsng 14552 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → (♯‘{𝐵}) = 1) | |
| 8 | 7 | 3ad2ant2 1152 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘{𝐵}) = 1) |
| 9 | 8 | oveq2d 7465 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ ¬ 𝐵 ∈ 𝐴) → ((♯‘𝐴) +e (♯‘{𝐵})) = ((♯‘𝐴) +e 1)) |
| 10 | 6, 9 | eqtrd 2798 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ ¬ 𝐵 ∈ 𝐴) → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e 1)) |
| 11 | 10 | 3expia 1139 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (¬ 𝐵 ∈ 𝐴 → (♯‘(𝐴 ∪ {𝐵})) = ((♯‘𝐴) +e 1))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ∩ cin 4092 ∪ cun 4152 ∅c0 4281 {csn 4588 ‘cfv 6564 (class class class)co 7449 Fincfn 9009 1c1 11238 +e cxad 13277 ♯chash 14513 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7781 ax-cnex 11293 ax-resscn 11294 ax-1cn 11295 ax-icn 11296 ax-addcl 11297 ax-addrcl 11298 ax-mulcl 11299 ax-mulrcl 11300 ax-mulcom 11301 ax-addass 11302 ax-mulass 11303 ax-distr 11304 ax-i2m1 11305 ax-1ne0 11306 ax-1rid 11307 ax-rnegex 11308 ax-rrecex 11309 ax-cnre 11310 ax-pre-lttri 11311 ax-pre-lttrn 11312 ax-pre-ltadd 11313 ax-pre-mulgt0 11314 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-pred 6328 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6518 df-fun 6566 df-fn 6567 df-f 6568 df-f1 6569 df-fo 6570 df-f1o 6571 df-fv 6572 df-riota 7406 df-ov 7452 df-oprab 7453 df-mpo 7454 df-om 7910 df-1st 8033 df-2nd 8034 df-frecs 8335 df-wrecs 8366 df-recs 8415 df-rdg 8454 df-1o 8512 df-oadd 8516 df-er 8753 df-en 9010 df-dom 9011 df-sdom 9012 df-fin 9013 df-dju 10017 df-card 10055 df-pnf 11382 df-mnf 11383 df-xr 11384 df-ltxr 11385 df-le 11386 df-sub 11580 df-neg 11581 df-nn 12374 df-n0 12645 df-xnn0 12718 df-z 12732 df-uz 13004 df-xadd 13280 df-fz 13678 df-hash 14514 |
| This theorem is used by: hashunsnggt 14577 |
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