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Mirrors > Home > ILE Home > Th. List > hashfzo | GIF version |
Description: Cardinality of a half-open set of integers. (Contributed by Stefan O'Rear, 15-Aug-2015.) |
Ref | Expression |
---|---|
hashfzo | ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fzo0 10124 | . . . . . 6 ⊢ (𝐴..^𝐴) = ∅ | |
2 | 1 | fveq2i 5499 | . . . . 5 ⊢ (♯‘(𝐴..^𝐴)) = (♯‘∅) |
3 | hash0 10731 | . . . . 5 ⊢ (♯‘∅) = 0 | |
4 | 2, 3 | eqtri 2191 | . . . 4 ⊢ (♯‘(𝐴..^𝐴)) = 0 |
5 | eluzel2 9492 | . . . . . 6 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → 𝐴 ∈ ℤ) | |
6 | 5 | zcnd 9335 | . . . . 5 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → 𝐴 ∈ ℂ) |
7 | 6 | subidd 8218 | . . . 4 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (𝐴 − 𝐴) = 0) |
8 | 4, 7 | eqtr4id 2222 | . . 3 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (♯‘(𝐴..^𝐴)) = (𝐴 − 𝐴)) |
9 | oveq2 5861 | . . . . 5 ⊢ (𝐵 = 𝐴 → (𝐴..^𝐵) = (𝐴..^𝐴)) | |
10 | 9 | fveq2d 5500 | . . . 4 ⊢ (𝐵 = 𝐴 → (♯‘(𝐴..^𝐵)) = (♯‘(𝐴..^𝐴))) |
11 | oveq1 5860 | . . . 4 ⊢ (𝐵 = 𝐴 → (𝐵 − 𝐴) = (𝐴 − 𝐴)) | |
12 | 10, 11 | eqeq12d 2185 | . . 3 ⊢ (𝐵 = 𝐴 → ((♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴) ↔ (♯‘(𝐴..^𝐴)) = (𝐴 − 𝐴))) |
13 | 8, 12 | syl5ibrcom 156 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (𝐵 = 𝐴 → (♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴))) |
14 | eluzelz 9496 | . . . . . . 7 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → 𝐵 ∈ ℤ) | |
15 | fzoval 10104 | . . . . . . 7 ⊢ (𝐵 ∈ ℤ → (𝐴..^𝐵) = (𝐴...(𝐵 − 1))) | |
16 | 14, 15 | syl 14 | . . . . . 6 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (𝐴..^𝐵) = (𝐴...(𝐵 − 1))) |
17 | 16 | fveq2d 5500 | . . . . 5 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (♯‘(𝐴..^𝐵)) = (♯‘(𝐴...(𝐵 − 1)))) |
18 | 17 | adantr 274 | . . . 4 ⊢ ((𝐵 ∈ (ℤ≥‘𝐴) ∧ (𝐵 − 1) ∈ (ℤ≥‘𝐴)) → (♯‘(𝐴..^𝐵)) = (♯‘(𝐴...(𝐵 − 1)))) |
19 | hashfz 10756 | . . . . 5 ⊢ ((𝐵 − 1) ∈ (ℤ≥‘𝐴) → (♯‘(𝐴...(𝐵 − 1))) = (((𝐵 − 1) − 𝐴) + 1)) | |
20 | 14 | zcnd 9335 | . . . . . . . 8 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → 𝐵 ∈ ℂ) |
21 | 1cnd 7936 | . . . . . . . 8 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → 1 ∈ ℂ) | |
22 | 20, 21, 6 | sub32d 8262 | . . . . . . 7 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → ((𝐵 − 1) − 𝐴) = ((𝐵 − 𝐴) − 1)) |
23 | 22 | oveq1d 5868 | . . . . . 6 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (((𝐵 − 1) − 𝐴) + 1) = (((𝐵 − 𝐴) − 1) + 1)) |
24 | 20, 6 | subcld 8230 | . . . . . . 7 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (𝐵 − 𝐴) ∈ ℂ) |
25 | ax-1cn 7867 | . . . . . . 7 ⊢ 1 ∈ ℂ | |
26 | npcan 8128 | . . . . . . 7 ⊢ (((𝐵 − 𝐴) ∈ ℂ ∧ 1 ∈ ℂ) → (((𝐵 − 𝐴) − 1) + 1) = (𝐵 − 𝐴)) | |
27 | 24, 25, 26 | sylancl 411 | . . . . . 6 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (((𝐵 − 𝐴) − 1) + 1) = (𝐵 − 𝐴)) |
28 | 23, 27 | eqtrd 2203 | . . . . 5 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (((𝐵 − 1) − 𝐴) + 1) = (𝐵 − 𝐴)) |
29 | 19, 28 | sylan9eqr 2225 | . . . 4 ⊢ ((𝐵 ∈ (ℤ≥‘𝐴) ∧ (𝐵 − 1) ∈ (ℤ≥‘𝐴)) → (♯‘(𝐴...(𝐵 − 1))) = (𝐵 − 𝐴)) |
30 | 18, 29 | eqtrd 2203 | . . 3 ⊢ ((𝐵 ∈ (ℤ≥‘𝐴) ∧ (𝐵 − 1) ∈ (ℤ≥‘𝐴)) → (♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴)) |
31 | 30 | ex 114 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → ((𝐵 − 1) ∈ (ℤ≥‘𝐴) → (♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴))) |
32 | uzm1 9517 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (𝐵 = 𝐴 ∨ (𝐵 − 1) ∈ (ℤ≥‘𝐴))) | |
33 | 13, 31, 32 | mpjaod 713 | 1 ⊢ (𝐵 ∈ (ℤ≥‘𝐴) → (♯‘(𝐴..^𝐵)) = (𝐵 − 𝐴)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1348 ∈ wcel 2141 ∅c0 3414 ‘cfv 5198 (class class class)co 5853 ℂcc 7772 0cc0 7774 1c1 7775 + caddc 7777 − cmin 8090 ℤcz 9212 ℤ≥cuz 9487 ...cfz 9965 ..^cfzo 10098 ♯chash 10709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-coll 4104 ax-sep 4107 ax-nul 4115 ax-pow 4160 ax-pr 4194 ax-un 4418 ax-setind 4521 ax-iinf 4572 ax-cnex 7865 ax-resscn 7866 ax-1cn 7867 ax-1re 7868 ax-icn 7869 ax-addcl 7870 ax-addrcl 7871 ax-mulcl 7872 ax-addcom 7874 ax-addass 7876 ax-distr 7878 ax-i2m1 7879 ax-0lt1 7880 ax-0id 7882 ax-rnegex 7883 ax-cnre 7885 ax-pre-ltirr 7886 ax-pre-ltwlin 7887 ax-pre-lttrn 7888 ax-pre-apti 7889 ax-pre-ltadd 7890 |
This theorem depends on definitions: df-bi 116 df-dc 830 df-3or 974 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-csb 3050 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-nul 3415 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-int 3832 df-iun 3875 df-br 3990 df-opab 4051 df-mpt 4052 df-tr 4088 df-id 4278 df-iord 4351 df-on 4353 df-ilim 4354 df-suc 4356 df-iom 4575 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-rn 4622 df-res 4623 df-ima 4624 df-iota 5160 df-fun 5200 df-fn 5201 df-f 5202 df-f1 5203 df-fo 5204 df-f1o 5205 df-fv 5206 df-riota 5809 df-ov 5856 df-oprab 5857 df-mpo 5858 df-1st 6119 df-2nd 6120 df-recs 6284 df-frec 6370 df-1o 6395 df-er 6513 df-en 6719 df-dom 6720 df-fin 6721 df-pnf 7956 df-mnf 7957 df-xr 7958 df-ltxr 7959 df-le 7960 df-sub 8092 df-neg 8093 df-inn 8879 df-n0 9136 df-z 9213 df-uz 9488 df-fz 9966 df-fzo 10099 df-ihash 10710 |
This theorem is referenced by: hashfzo0 10758 |
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