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Mirrors > Home > ILE Home > Th. List > dvlemap | GIF version |
Description: Closure for a difference quotient. (Contributed by Mario Carneiro, 1-Sep-2014.) (Revised by Jim Kingdon, 27-Jun-2023.) |
Ref | Expression |
---|---|
dvlem.1 | ⊢ (𝜑 → 𝐹:𝐷⟶ℂ) |
dvlem.2 | ⊢ (𝜑 → 𝐷 ⊆ ℂ) |
dvlem.3 | ⊢ (𝜑 → 𝐵 ∈ 𝐷) |
Ref | Expression |
---|---|
dvlemap | ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (((𝐹‘𝐴) − (𝐹‘𝐵)) / (𝐴 − 𝐵)) ∈ ℂ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dvlem.1 | . . . . 5 ⊢ (𝜑 → 𝐹:𝐷⟶ℂ) | |
2 | 1 | adantr 274 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐹:𝐷⟶ℂ) |
3 | elrabi 2883 | . . . . 5 ⊢ (𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵} → 𝐴 ∈ 𝐷) | |
4 | 3 | adantl 275 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐴 ∈ 𝐷) |
5 | 2, 4 | ffvelrnd 5632 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (𝐹‘𝐴) ∈ ℂ) |
6 | dvlem.3 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝐷) | |
7 | 6 | adantr 274 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐵 ∈ 𝐷) |
8 | 2, 7 | ffvelrnd 5632 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (𝐹‘𝐵) ∈ ℂ) |
9 | 5, 8 | subcld 8230 | . 2 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → ((𝐹‘𝐴) − (𝐹‘𝐵)) ∈ ℂ) |
10 | dvlem.2 | . . . . 5 ⊢ (𝜑 → 𝐷 ⊆ ℂ) | |
11 | 10 | adantr 274 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐷 ⊆ ℂ) |
12 | 11, 4 | sseldd 3148 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐴 ∈ ℂ) |
13 | 10, 6 | sseldd 3148 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
14 | 13 | adantr 274 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐵 ∈ ℂ) |
15 | 12, 14 | subcld 8230 | . 2 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (𝐴 − 𝐵) ∈ ℂ) |
16 | breq1 3992 | . . . . . 6 ⊢ (𝑤 = 𝐴 → (𝑤 # 𝐵 ↔ 𝐴 # 𝐵)) | |
17 | 16 | elrab 2886 | . . . . 5 ⊢ (𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵} ↔ (𝐴 ∈ 𝐷 ∧ 𝐴 # 𝐵)) |
18 | 17 | simprbi 273 | . . . 4 ⊢ (𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵} → 𝐴 # 𝐵) |
19 | 18 | adantl 275 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → 𝐴 # 𝐵) |
20 | 12, 14, 19 | subap0d 8563 | . 2 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (𝐴 − 𝐵) # 0) |
21 | 9, 15, 20 | divclapd 8707 | 1 ⊢ ((𝜑 ∧ 𝐴 ∈ {𝑤 ∈ 𝐷 ∣ 𝑤 # 𝐵}) → (((𝐹‘𝐴) − (𝐹‘𝐵)) / (𝐴 − 𝐵)) ∈ ℂ) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 2141 {crab 2452 ⊆ wss 3121 class class class wbr 3989 ⟶wf 5194 ‘cfv 5198 (class class class)co 5853 ℂcc 7772 − cmin 8090 # cap 8500 / cdiv 8589 |
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-sep 4107 ax-pow 4160 ax-pr 4194 ax-un 4418 ax-setind 4521 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-mulrcl 7873 ax-addcom 7874 ax-mulcom 7875 ax-addass 7876 ax-mulass 7877 ax-distr 7878 ax-i2m1 7879 ax-0lt1 7880 ax-1rid 7881 ax-0id 7882 ax-rnegex 7883 ax-precex 7884 ax-cnre 7885 ax-pre-ltirr 7886 ax-pre-ltwlin 7887 ax-pre-lttrn 7888 ax-pre-apti 7889 ax-pre-ltadd 7890 ax-pre-mulgt0 7891 ax-pre-mulext 7892 |
This theorem depends on definitions: df-bi 116 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-rmo 2456 df-rab 2457 df-v 2732 df-sbc 2956 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-br 3990 df-opab 4051 df-id 4278 df-po 4281 df-iso 4282 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-rn 4622 df-iota 5160 df-fun 5200 df-fn 5201 df-f 5202 df-fv 5206 df-riota 5809 df-ov 5856 df-oprab 5857 df-mpo 5858 df-pnf 7956 df-mnf 7957 df-xr 7958 df-ltxr 7959 df-le 7960 df-sub 8092 df-neg 8093 df-reap 8494 df-ap 8501 df-div 8590 |
This theorem is referenced by: dvfgg 13451 dvcnp2cntop 13457 dvaddxxbr 13459 dvmulxxbr 13460 dvcoapbr 13465 dvcjbr 13466 |
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