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Theorem List for Metamath Proof Explorer - 23601-23700   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremitgcnlem 23601* Expand out the sum in dfitg 23581. (Contributed by Mario Carneiro, 1-Aug-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
𝑅 = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘𝐵)), (ℜ‘𝐵), 0)))    &   𝑆 = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ -(ℜ‘𝐵)), -(ℜ‘𝐵), 0)))    &   𝑇 = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℑ‘𝐵)), (ℑ‘𝐵), 0)))    &   𝑈 = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ -(ℑ‘𝐵)), -(ℑ‘𝐵), 0)))    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐵 d𝑥 = ((𝑅𝑆) + (i · (𝑇𝑈))))

Theoremiblrelem 23602* Integrability of a real function. (Contributed by Mario Carneiro, 31-Jul-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)       (𝜑 → ((𝑥𝐴𝐵) ∈ 𝐿1 ↔ ((𝑥𝐴𝐵) ∈ MblFn ∧ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ 𝐵), 𝐵, 0))) ∈ ℝ ∧ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ -𝐵), -𝐵, 0))) ∈ ℝ)))

Theoremiblposlem 23603* Lemma for iblpos 23604. (Contributed by Mario Carneiro, 31-Jul-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)       (𝜑 → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ -𝐵), -𝐵, 0))) = 0)

Theoremiblpos 23604* Integrability of a nonnegative function. (Contributed by Mario Carneiro, 31-Jul-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)       (𝜑 → ((𝑥𝐴𝐵) ∈ 𝐿1 ↔ ((𝑥𝐴𝐵) ∈ MblFn ∧ (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, 𝐵, 0))) ∈ ℝ)))

Theoremiblre 23605* Integrability of a real function. (Contributed by Mario Carneiro, 11-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)       (𝜑 → ((𝑥𝐴𝐵) ∈ 𝐿1 ↔ ((𝑥𝐴 ↦ if(0 ≤ 𝐵, 𝐵, 0)) ∈ 𝐿1 ∧ (𝑥𝐴 ↦ if(0 ≤ -𝐵, -𝐵, 0)) ∈ 𝐿1)))

Theoremitgrevallem1 23606* Lemma for itgposval 23607 and itgreval 23608. (Contributed by Mario Carneiro, 31-Jul-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐵 d𝑥 = ((∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ 𝐵), 𝐵, 0))) − (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ -𝐵), -𝐵, 0)))))

Theoremitgposval 23607* The integral of a nonnegative function. (Contributed by Mario Carneiro, 31-Jul-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)       (𝜑 → ∫𝐴𝐵 d𝑥 = (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, 𝐵, 0))))

Theoremitgreval 23608* Decompose the integral of a real function into positive and negative parts. (Contributed by Mario Carneiro, 31-Jul-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐵 d𝑥 = (∫𝐴if(0 ≤ 𝐵, 𝐵, 0) d𝑥 − ∫𝐴if(0 ≤ -𝐵, -𝐵, 0) d𝑥))

Theoremitgrecl 23609* Real closure of an integral. (Contributed by Mario Carneiro, 11-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐵 d𝑥 ∈ ℝ)

Theoremiblcn 23610* Integrability of a complex function. (Contributed by Mario Carneiro, 6-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵 ∈ ℂ)       (𝜑 → ((𝑥𝐴𝐵) ∈ 𝐿1 ↔ ((𝑥𝐴 ↦ (ℜ‘𝐵)) ∈ 𝐿1 ∧ (𝑥𝐴 ↦ (ℑ‘𝐵)) ∈ 𝐿1)))

Theoremitgcnval 23611* Decompose the integral of a complex function into real and imaginary parts. (Contributed by Mario Carneiro, 6-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐵 d𝑥 = (∫𝐴(ℜ‘𝐵) d𝑥 + (i · ∫𝐴(ℑ‘𝐵) d𝑥)))

Theoremitgre 23612* Real part of an integral. (Contributed by Mario Carneiro, 14-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (ℜ‘∫𝐴𝐵 d𝑥) = ∫𝐴(ℜ‘𝐵) d𝑥)

Theoremitgim 23613* Imaginary part of an integral. (Contributed by Mario Carneiro, 14-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (ℑ‘∫𝐴𝐵 d𝑥) = ∫𝐴(ℑ‘𝐵) d𝑥)

Theoremiblneg 23614* The negative of an integrable function is integrable. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (𝑥𝐴 ↦ -𝐵) ∈ 𝐿1)

Theoremitgneg 23615* Negation of an integral. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → -∫𝐴𝐵 d𝑥 = ∫𝐴-𝐵 d𝑥)

Theoremiblss 23616* A subset of an integrable function is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
(𝜑𝐴𝐵)    &   (𝜑𝐴 ∈ dom vol)    &   ((𝜑𝑥𝐵) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)       (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)

Theoremiblss2 23617* Change the domain of an integrability predicate. (Contributed by Mario Carneiro, 13-Aug-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
(𝜑𝐴𝐵)    &   (𝜑𝐵 ∈ dom vol)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   ((𝜑𝑥 ∈ (𝐵𝐴)) → 𝐶 = 0)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)

Theoremitgitg2 23618* Transfer an integral using 2 to an equivalent integral using . (Contributed by Mario Carneiro, 6-Aug-2014.)
((𝜑𝑥 ∈ ℝ) → 𝐴 ∈ ℝ)    &   ((𝜑𝑥 ∈ ℝ) → 0 ≤ 𝐴)    &   (𝜑 → (𝑥 ∈ ℝ ↦ 𝐴) ∈ 𝐿1)       (𝜑 → ∫ℝ𝐴 d𝑥 = (∫2‘(𝑥 ∈ ℝ ↦ 𝐴)))

Theoremi1fibl 23619 A simple function is integrable. (Contributed by Mario Carneiro, 6-Aug-2014.)
(𝐹 ∈ dom ∫1𝐹 ∈ 𝐿1)

Theoremitgitg1 23620* Transfer an integral using 1 to an equivalent integral using . (Contributed by Mario Carneiro, 6-Aug-2014.)
(𝐹 ∈ dom ∫1 → ∫ℝ(𝐹𝑥) d𝑥 = (∫1𝐹))

Theoremitgle 23621* Monotonicity of an integral. (Contributed by Mario Carneiro, 11-Aug-2014.)
(𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐵𝐶)       (𝜑 → ∫𝐴𝐵 d𝑥 ≤ ∫𝐴𝐶 d𝑥)

Theoremitgge0 23622* The integral of a positive function is positive. (Contributed by Mario Carneiro, 25-Aug-2014.)
(𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)       (𝜑 → 0 ≤ ∫𝐴𝐵 d𝑥)

Theoremitgss 23623* Expand the set of an integral by adding zeroes outside the domain. (Contributed by Mario Carneiro, 11-Aug-2014.) (Revised by Mario Carneiro, 23-Aug-2014.)
(𝜑𝐴𝐵)    &   ((𝜑𝑥 ∈ (𝐵𝐴)) → 𝐶 = 0)       (𝜑 → ∫𝐴𝐶 d𝑥 = ∫𝐵𝐶 d𝑥)

Theoremitgss2 23624* Expand the set of an integral by adding zeroes outside the domain. (Contributed by Mario Carneiro, 11-Aug-2014.)
(𝐴𝐵 → ∫𝐴𝐶 d𝑥 = ∫𝐵if(𝑥𝐴, 𝐶, 0) d𝑥)

Theoremitgeqa 23625* Approximate equality of integrals. If 𝐶(𝑥) = 𝐷(𝑥) for almost all 𝑥, then 𝐵𝐶(𝑥) d𝑥 = ∫𝐵𝐷(𝑥) d𝑥 and one is integrable iff the other is. (Contributed by Mario Carneiro, 12-Aug-2014.) (Revised by Mario Carneiro, 2-Sep-2014.)
((𝜑𝑥𝐵) → 𝐶 ∈ ℂ)    &   ((𝜑𝑥𝐵) → 𝐷 ∈ ℂ)    &   (𝜑𝐴 ⊆ ℝ)    &   (𝜑 → (vol*‘𝐴) = 0)    &   ((𝜑𝑥 ∈ (𝐵𝐴)) → 𝐶 = 𝐷)       (𝜑 → (((𝑥𝐵𝐶) ∈ 𝐿1 ↔ (𝑥𝐵𝐷) ∈ 𝐿1) ∧ ∫𝐵𝐶 d𝑥 = ∫𝐵𝐷 d𝑥))

Theoremitgss3 23626* Expand the set of an integral by a nullset. (Contributed by Mario Carneiro, 13-Aug-2014.) (Revised by Mario Carneiro, 2-Sep-2014.)
(𝜑𝐴𝐵)    &   (𝜑𝐵 ⊆ ℝ)    &   (𝜑 → (vol*‘(𝐵𝐴)) = 0)    &   ((𝜑𝑥𝐵) → 𝐶 ∈ ℂ)       (𝜑 → (((𝑥𝐴𝐶) ∈ 𝐿1 ↔ (𝑥𝐵𝐶) ∈ 𝐿1) ∧ ∫𝐴𝐶 d𝑥 = ∫𝐵𝐶 d𝑥))

Theoremitgioo 23627* Equality of integrals on open and closed intervals. (Contributed by Mario Carneiro, 2-Sep-2014.)
(𝜑𝐴 ∈ ℝ)    &   (𝜑𝐵 ∈ ℝ)    &   ((𝜑𝑥 ∈ (𝐴[,]𝐵)) → 𝐶 ∈ ℂ)       (𝜑 → ∫(𝐴(,)𝐵)𝐶 d𝑥 = ∫(𝐴[,]𝐵)𝐶 d𝑥)

Theoremitgless 23628* Expand the integral of a nonnegative function. (Contributed by Mario Carneiro, 31-Aug-2014.)
(𝜑𝐴𝐵)    &   (𝜑𝐴 ∈ dom vol)    &   ((𝜑𝑥𝐵) → 𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐵) → 0 ≤ 𝐶)    &   (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)       (𝜑 → ∫𝐴𝐶 d𝑥 ≤ ∫𝐵𝐶 d𝑥)

Theoremiblconst 23629 A constant function is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
((𝐴 ∈ dom vol ∧ (vol‘𝐴) ∈ ℝ ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}) ∈ 𝐿1)

Theoremitgconst 23630* Integral of a constant function. (Contributed by Mario Carneiro, 12-Aug-2014.)
((𝐴 ∈ dom vol ∧ (vol‘𝐴) ∈ ℝ ∧ 𝐵 ∈ ℂ) → ∫𝐴𝐵 d𝑥 = (𝐵 · (vol‘𝐴)))

((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐷 = (𝐵 + 𝐶))    &   (𝜑 → (𝑥𝐴𝐵) ∈ MblFn)    &   (𝜑 → (𝑥𝐴𝐶) ∈ MblFn)    &   (𝜑 → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ 𝐵), 𝐵, 0))) ∈ ℝ)    &   (𝜑 → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ 𝐶), 𝐶, 0))) ∈ ℝ)       (𝜑 → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ 𝐷), 𝐷, 0))) ∈ ℝ)

Theoremibladd 23632* Add two integrals over the same domain. (Contributed by Mario Carneiro, 17-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → (𝑥𝐴 ↦ (𝐵 + 𝐶)) ∈ 𝐿1)

Theoremiblsub 23633* Subtract two integrals over the same domain. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → (𝑥𝐴 ↦ (𝐵𝐶)) ∈ 𝐿1)

((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐶)       (𝜑 → ∫𝐴(𝐵 + 𝐶) d𝑥 = (∫𝐴𝐵 d𝑥 + ∫𝐴𝐶 d𝑥))

((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐶 ∈ ℝ)       (𝜑 → ∫𝐴(𝐵 + 𝐶) d𝑥 = (∫𝐴𝐵 d𝑥 + ∫𝐴𝐶 d𝑥))

Theoremitgadd 23636* Add two integrals over the same domain. (Contributed by Mario Carneiro, 17-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → ∫𝐴(𝐵 + 𝐶) d𝑥 = (∫𝐴𝐵 d𝑥 + ∫𝐴𝐶 d𝑥))

Theoremitgsub 23637* Subtract two integrals over the same domain. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → ∫𝐴(𝐵𝐶) d𝑥 = (∫𝐴𝐵 d𝑥 − ∫𝐴𝐶 d𝑥))

Theoremitgfsum 23638* Take a finite sum of integrals over the same domain. (Contributed by Mario Carneiro, 24-Aug-2014.)
(𝜑𝐴 ∈ dom vol)    &   (𝜑𝐵 ∈ Fin)    &   ((𝜑 ∧ (𝑥𝐴𝑘𝐵)) → 𝐶𝑉)    &   ((𝜑𝑘𝐵) → (𝑥𝐴𝐶) ∈ 𝐿1)       (𝜑 → ((𝑥𝐴 ↦ Σ𝑘𝐵 𝐶) ∈ 𝐿1 ∧ ∫𝐴Σ𝑘𝐵 𝐶 d𝑥 = Σ𝑘𝐵𝐴𝐶 d𝑥))

Theoremiblabslem 23639* Lemma for iblabs 23640. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   𝐺 = (𝑥 ∈ ℝ ↦ if(𝑥𝐴, (abs‘(𝐹𝐵)), 0))    &   (𝜑 → (𝑥𝐴 ↦ (𝐹𝐵)) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → (𝐹𝐵) ∈ ℝ)       (𝜑 → (𝐺 ∈ MblFn ∧ (∫2𝐺) ∈ ℝ))

Theoremiblabs 23640* The absolute value of an integrable function is integrable. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (𝑥𝐴 ↦ (abs‘𝐵)) ∈ 𝐿1)

Theoremiblabsr 23641* A measurable function is integrable iff its absolute value is integrable. (See iblabs 23640 for the forward implication.) (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ MblFn)    &   (𝜑 → (𝑥𝐴 ↦ (abs‘𝐵)) ∈ 𝐿1)       (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)

Theoremiblmulc2 23642* Multiply an integral by a constant. (Contributed by Mario Carneiro, 25-Aug-2014.)
(𝜑𝐶 ∈ ℂ)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (𝑥𝐴 ↦ (𝐶 · 𝐵)) ∈ 𝐿1)

Theoremitgmulc2lem1 23643* Lemma for itgmulc2 23645: positive real case. (Contributed by Mario Carneiro, 25-Aug-2014.)
(𝜑𝐶 ∈ ℂ)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   (𝜑𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → 0 ≤ 𝐶)    &   ((𝜑𝑥𝐴) → 0 ≤ 𝐵)       (𝜑 → (𝐶 · ∫𝐴𝐵 d𝑥) = ∫𝐴(𝐶 · 𝐵) d𝑥)

Theoremitgmulc2lem2 23644* Lemma for itgmulc2 23645: real case. (Contributed by Mario Carneiro, 25-Aug-2014.)
(𝜑𝐶 ∈ ℂ)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   (𝜑𝐶 ∈ ℝ)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)       (𝜑 → (𝐶 · ∫𝐴𝐵 d𝑥) = ∫𝐴(𝐶 · 𝐵) d𝑥)

Theoremitgmulc2 23645* Multiply an integral by a constant. (Contributed by Mario Carneiro, 25-Aug-2014.)
(𝜑𝐶 ∈ ℂ)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (𝐶 · ∫𝐴𝐵 d𝑥) = ∫𝐴(𝐶 · 𝐵) d𝑥)

Theoremitgabs 23646* The triangle inequality for integrals. (Contributed by Mario Carneiro, 25-Aug-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)       (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)

Theoremitgsplit 23647* The integral splits under an almost disjoint union. (Contributed by Mario Carneiro, 11-Aug-2014.)
(𝜑 → (vol*‘(𝐴𝐵)) = 0)    &   (𝜑𝑈 = (𝐴𝐵))    &   ((𝜑𝑥𝑈) → 𝐶𝑉)    &   (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)    &   (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)       (𝜑 → ∫𝑈𝐶 d𝑥 = (∫𝐴𝐶 d𝑥 + ∫𝐵𝐶 d𝑥))

Theoremitgspliticc 23648* The integral splits on closed intervals with matching endpoints. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝐴 ∈ ℝ)    &   (𝜑𝐶 ∈ ℝ)    &   (𝜑𝐵 ∈ (𝐴[,]𝐶))    &   ((𝜑𝑥 ∈ (𝐴[,]𝐶)) → 𝐷𝑉)    &   (𝜑 → (𝑥 ∈ (𝐴[,]𝐵) ↦ 𝐷) ∈ 𝐿1)    &   (𝜑 → (𝑥 ∈ (𝐵[,]𝐶) ↦ 𝐷) ∈ 𝐿1)       (𝜑 → ∫(𝐴[,]𝐶)𝐷 d𝑥 = (∫(𝐴[,]𝐵)𝐷 d𝑥 + ∫(𝐵[,]𝐶)𝐷 d𝑥))

Theoremitgsplitioo 23649* The integral splits on open intervals with matching endpoints. (Contributed by Mario Carneiro, 2-Sep-2014.)
(𝜑𝐴 ∈ ℝ)    &   (𝜑𝐶 ∈ ℝ)    &   (𝜑𝐵 ∈ (𝐴[,]𝐶))    &   ((𝜑𝑥 ∈ (𝐴(,)𝐶)) → 𝐷 ∈ ℂ)    &   (𝜑 → (𝑥 ∈ (𝐴(,)𝐵) ↦ 𝐷) ∈ 𝐿1)    &   (𝜑 → (𝑥 ∈ (𝐵(,)𝐶) ↦ 𝐷) ∈ 𝐿1)       (𝜑 → ∫(𝐴(,)𝐶)𝐷 d𝑥 = (∫(𝐴(,)𝐵)𝐷 d𝑥 + ∫(𝐵(,)𝐶)𝐷 d𝑥))

Theorembddmulibl 23650* A bounded function times an integrable function is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
((𝐹 ∈ MblFn ∧ 𝐺 ∈ 𝐿1 ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ dom 𝐹(abs‘(𝐹𝑦)) ≤ 𝑥) → (𝐹𝑓 · 𝐺) ∈ 𝐿1)

Theorembddibl 23651* A bounded function is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
((𝐹 ∈ MblFn ∧ (vol‘dom 𝐹) ∈ ℝ ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ dom 𝐹(abs‘(𝐹𝑦)) ≤ 𝑥) → 𝐹 ∈ 𝐿1)

Theoremcniccibl 23652 A continuous function on a closed bounded interval is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℂ)) → 𝐹 ∈ 𝐿1)

Theoremitggt0 23653* The integral of a strictly positive function is positive. (Contributed by Mario Carneiro, 30-Aug-2014.)
(𝜑 → 0 < (vol‘𝐴))    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ+)       (𝜑 → 0 < ∫𝐴𝐵 d𝑥)

Theoremitgcn 23654* Transfer itg2cn 23575 to the full Lebesgue integral. (Contributed by Mario Carneiro, 1-Sep-2014.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑 → (𝑥𝐴𝐵) ∈ 𝐿1)    &   (𝜑𝐶 ∈ ℝ+)       (𝜑 → ∃𝑑 ∈ ℝ+𝑢 ∈ dom vol((𝑢𝐴 ∧ (vol‘𝑢) < 𝑑) → ∫𝑢(abs‘𝐵) d𝑥 < 𝐶))

13.2.2.2  Lesbesgue directed integral

Syntaxcdit 23655 Extend class notation with the directed integral.
class ⨜[𝐴𝐵]𝐶 d𝑥

Definitiondf-ditg 23656 Define the directed integral, which is just a regular integral but with a sign change when the limits are interchanged. The 𝐴 and 𝐵 here are the lower and upper limits of the integral, usually written as a subscript and superscript next to the integral sign. We define the region of integration to be an open interval instead of closed so that we can use +∞, -∞ for limits and also integrate up to a singularity at an endpoint. (Contributed by Mario Carneiro, 13-Aug-2014.)
⨜[𝐴𝐵]𝐶 d𝑥 = if(𝐴𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥)

Theoremditgeq1 23657* Equality theorem for the directed integral. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝐴 = 𝐵 → ⨜[𝐴𝐶]𝐷 d𝑥 = ⨜[𝐵𝐶]𝐷 d𝑥)

Theoremditgeq2 23658* Equality theorem for the directed integral. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝐴 = 𝐵 → ⨜[𝐶𝐴]𝐷 d𝑥 = ⨜[𝐶𝐵]𝐷 d𝑥)

Theoremditgeq3 23659* Equality theorem for the directed integral. (The domain of the equality here is very rough; for more precise bounds one should decompose it with ditgpos 23665 first and use the equality theorems for df-itg 23437.) (Contributed by Mario Carneiro, 13-Aug-2014.)
(∀𝑥 ∈ ℝ 𝐷 = 𝐸 → ⨜[𝐴𝐵]𝐷 d𝑥 = ⨜[𝐴𝐵]𝐸 d𝑥)

Theoremditgeq3dv 23660* Equality theorem for the directed integral. (Contributed by Mario Carneiro, 13-Aug-2014.)
((𝜑𝑥 ∈ ℝ) → 𝐷 = 𝐸)       (𝜑 → ⨜[𝐴𝐵]𝐷 d𝑥 = ⨜[𝐴𝐵]𝐸 d𝑥)

Theoremditgex 23661 A directed integral is a set. (Contributed by Mario Carneiro, 7-Sep-2014.)
⨜[𝐴𝐵]𝐶 d𝑥 ∈ V

Theoremditg0 23662* Value of the directed integral from a point to itself. (Contributed by Mario Carneiro, 13-Aug-2014.)
⨜[𝐴𝐴]𝐵 d𝑥 = 0

Theoremcbvditg 23663* Change bound variable in a directed integral. (Contributed by Mario Carneiro, 7-Sep-2014.)
(𝑥 = 𝑦𝐶 = 𝐷)    &   𝑦𝐶    &   𝑥𝐷       ⨜[𝐴𝐵]𝐶 d𝑥 = ⨜[𝐴𝐵]𝐷 d𝑦

Theoremcbvditgv 23664* Change bound variable in a directed integral. (Contributed by Mario Carneiro, 7-Sep-2014.)
(𝑥 = 𝑦𝐶 = 𝐷)       ⨜[𝐴𝐵]𝐶 d𝑥 = ⨜[𝐴𝐵]𝐷 d𝑦

Theoremditgpos 23665* Value of the directed integral in the forward direction. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝐴𝐵)       (𝜑 → ⨜[𝐴𝐵]𝐶 d𝑥 = ∫(𝐴(,)𝐵)𝐶 d𝑥)

Theoremditgneg 23666* Value of the directed integral in the backward direction. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝐴𝐵)    &   (𝜑𝐴 ∈ ℝ)    &   (𝜑𝐵 ∈ ℝ)       (𝜑 → ⨜[𝐵𝐴]𝐶 d𝑥 = -∫(𝐴(,)𝐵)𝐶 d𝑥)

Theoremditgcl 23667* Closure of a directed integral. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝑋 ∈ ℝ)    &   (𝜑𝑌 ∈ ℝ)    &   (𝜑𝐴 ∈ (𝑋[,]𝑌))    &   (𝜑𝐵 ∈ (𝑋[,]𝑌))    &   ((𝜑𝑥 ∈ (𝑋(,)𝑌)) → 𝐶𝑉)    &   (𝜑 → (𝑥 ∈ (𝑋(,)𝑌) ↦ 𝐶) ∈ 𝐿1)       (𝜑 → ⨜[𝐴𝐵]𝐶 d𝑥 ∈ ℂ)

Theoremditgswap 23668* Reverse a directed integral. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝑋 ∈ ℝ)    &   (𝜑𝑌 ∈ ℝ)    &   (𝜑𝐴 ∈ (𝑋[,]𝑌))    &   (𝜑𝐵 ∈ (𝑋[,]𝑌))    &   ((𝜑𝑥 ∈ (𝑋(,)𝑌)) → 𝐶𝑉)    &   (𝜑 → (𝑥 ∈ (𝑋(,)𝑌) ↦ 𝐶) ∈ 𝐿1)       (𝜑 → ⨜[𝐵𝐴]𝐶 d𝑥 = -⨜[𝐴𝐵]𝐶 d𝑥)

Theoremditgsplitlem 23669* Lemma for ditgsplit 23670. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝑋 ∈ ℝ)    &   (𝜑𝑌 ∈ ℝ)    &   (𝜑𝐴 ∈ (𝑋[,]𝑌))    &   (𝜑𝐵 ∈ (𝑋[,]𝑌))    &   (𝜑𝐶 ∈ (𝑋[,]𝑌))    &   ((𝜑𝑥 ∈ (𝑋(,)𝑌)) → 𝐷𝑉)    &   (𝜑 → (𝑥 ∈ (𝑋(,)𝑌) ↦ 𝐷) ∈ 𝐿1)    &   ((𝜓𝜃) ↔ (𝐴𝐵𝐵𝐶))       (((𝜑𝜓) ∧ 𝜃) → ⨜[𝐴𝐶]𝐷 d𝑥 = (⨜[𝐴𝐵]𝐷 d𝑥 + ⨜[𝐵𝐶]𝐷 d𝑥))

Theoremditgsplit 23670* This theorem is the raison d'être for the directed integral, because unlike itgspliticc 23648, there is no constraint on the ordering of the points 𝐴, 𝐵, 𝐶 in the domain. (Contributed by Mario Carneiro, 13-Aug-2014.)
(𝜑𝑋 ∈ ℝ)    &   (𝜑𝑌 ∈ ℝ)    &   (𝜑𝐴 ∈ (𝑋[,]𝑌))    &   (𝜑𝐵 ∈ (𝑋[,]𝑌))    &   (𝜑𝐶 ∈ (𝑋[,]𝑌))    &   ((𝜑𝑥 ∈ (𝑋(,)𝑌)) → 𝐷𝑉)    &   (𝜑 → (𝑥 ∈ (𝑋(,)𝑌) ↦ 𝐷) ∈ 𝐿1)       (𝜑 → ⨜[𝐴𝐶]𝐷 d𝑥 = (⨜[𝐴𝐵]𝐷 d𝑥 + ⨜[𝐵𝐶]𝐷 d𝑥))

13.3  Derivatives

13.3.1  Real and complex differentiation

13.3.1.1  Derivatives of functions of one complex or real variable

Syntaxclimc 23671 The limit operator.
class lim

Syntaxcdv 23672 The derivative operator.
class D

Syntaxcdvn 23673 The 𝑛-th derivative operator.
class D𝑛

Syntaxccpn 23674 The set of 𝑛-times continuously differentiable functions.
class Cn

Definitiondf-limc 23675* Define the set of limits of a complex function at a point. Under normal circumstances, this will be a singleton or empty, depending on whether the limit exists. (Contributed by Mario Carneiro, 24-Dec-2016.)
lim = (𝑓 ∈ (ℂ ↑pm ℂ), 𝑥 ∈ ℂ ↦ {𝑦[(TopOpen‘ℂfld) / 𝑗](𝑧 ∈ (dom 𝑓 ∪ {𝑥}) ↦ if(𝑧 = 𝑥, 𝑦, (𝑓𝑧))) ∈ (((𝑗t (dom 𝑓 ∪ {𝑥})) CnP 𝑗)‘𝑥)})

Definitiondf-dv 23676* Define the derivative operator on functions on the reals. This acts on functions to produce a function that is defined where the original function is differentiable, with value the derivative of the function at these points. The set 𝑠 here is the ambient topological space under which we are evaluating the continuity of the difference quotient. Although the definition is valid for any subset of and is well-behaved when 𝑠 contains no isolated points, we will restrict our attention to the cases 𝑠 = ℝ or 𝑠 = ℂ for the majority of the development, these corresponding respectively to real and complex differentiation. (Contributed by Mario Carneiro, 7-Aug-2014.)
D = (𝑠 ∈ 𝒫 ℂ, 𝑓 ∈ (ℂ ↑pm 𝑠) ↦ 𝑥 ∈ ((int‘((TopOpen‘ℂfld) ↾t 𝑠))‘dom 𝑓)({𝑥} × ((𝑧 ∈ (dom 𝑓 ∖ {𝑥}) ↦ (((𝑓𝑧) − (𝑓𝑥)) / (𝑧𝑥))) lim 𝑥)))

Definitiondf-dvn 23677* Define the 𝑛-th derivative operator on functions on the complex numbers. This just iterates the derivative operation according to the last argument. (Contributed by Mario Carneiro, 11-Feb-2015.)
D𝑛 = (𝑠 ∈ 𝒫 ℂ, 𝑓 ∈ (ℂ ↑pm 𝑠) ↦ seq0(((𝑥 ∈ V ↦ (𝑠 D 𝑥)) ∘ 1st ), (ℕ0 × {𝑓})))

Definitiondf-cpn 23678* Define the set of 𝑛-times continuously differentiable functions. (Contributed by Stefan O'Rear, 15-Nov-2014.)
Cn = (𝑠 ∈ 𝒫 ℂ ↦ (𝑥 ∈ ℕ0 ↦ {𝑓 ∈ (ℂ ↑pm 𝑠) ∣ ((𝑠 D𝑛 𝑓)‘𝑥) ∈ (dom 𝑓cn→ℂ)}))

Theoremreldv 23679 The derivative function is a relation. (Contributed by Mario Carneiro, 7-Aug-2014.) (Revised by Mario Carneiro, 24-Dec-2016.)
Rel (𝑆 D 𝐹)

Theoremlimcvallem 23680* Lemma for ellimc 23682. (Contributed by Mario Carneiro, 25-Dec-2016.)
𝐽 = (𝐾t (𝐴 ∪ {𝐵}))    &   𝐾 = (TopOpen‘ℂfld)    &   𝐺 = (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝐶, (𝐹𝑧)))       ((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) → (𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵) → 𝐶 ∈ ℂ))

Theoremlimcfval 23681* Value and set bounds on the limit operator. (Contributed by Mario Carneiro, 25-Dec-2016.)
𝐽 = (𝐾t (𝐴 ∪ {𝐵}))    &   𝐾 = (TopOpen‘ℂfld)       ((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐹 lim 𝐵) = {𝑦 ∣ (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝑦, (𝐹𝑧))) ∈ ((𝐽 CnP 𝐾)‘𝐵)} ∧ (𝐹 lim 𝐵) ⊆ ℂ))

Theoremellimc 23682* Value of the limit predicate. 𝐶 is the limit of the function 𝐹 at 𝐵 if the function 𝐺, formed by adding 𝐵 to the domain of 𝐹 and setting it to 𝐶, is continuous at 𝐵. (Contributed by Mario Carneiro, 25-Dec-2016.)
𝐽 = (𝐾t (𝐴 ∪ {𝐵}))    &   𝐾 = (TopOpen‘ℂfld)    &   𝐺 = (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝐶, (𝐹𝑧)))    &   (𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ℂ)       (𝜑 → (𝐶 ∈ (𝐹 lim 𝐵) ↔ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)))

Theoremlimcrcl 23683 Reverse closure for the limit operator. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝐶 ∈ (𝐹 lim 𝐵) → (𝐹:dom 𝐹⟶ℂ ∧ dom 𝐹 ⊆ ℂ ∧ 𝐵 ∈ ℂ))

Theoremlimccl 23684 Closure of the limit operator. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝐹 lim 𝐵) ⊆ ℂ

Theoremlimcdif 23685 It suffices to consider functions which are not defined at 𝐵 to define the limit of a function. In particular, the value of the original function 𝐹 at 𝐵 does not affect the limit of 𝐹. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)       (𝜑 → (𝐹 lim 𝐵) = ((𝐹 ↾ (𝐴 ∖ {𝐵})) lim 𝐵))

Theoremellimc2 23686* Write the definition of a limit directly in terms of open sets of the topology on the complex numbers. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ℂ)    &   𝐾 = (TopOpen‘ℂfld)       (𝜑 → (𝐶 ∈ (𝐹 lim 𝐵) ↔ (𝐶 ∈ ℂ ∧ ∀𝑢𝐾 (𝐶𝑢 → ∃𝑤𝐾 (𝐵𝑤 ∧ (𝐹 “ (𝑤 ∩ (𝐴 ∖ {𝐵}))) ⊆ 𝑢)))))

Theoremlimcnlp 23687 If 𝐵 is not a limit point of the domain of the function 𝐹, then every point is a limit of 𝐹 at 𝐵. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ℂ)    &   𝐾 = (TopOpen‘ℂfld)    &   (𝜑 → ¬ 𝐵 ∈ ((limPt‘𝐾)‘𝐴))       (𝜑 → (𝐹 lim 𝐵) = ℂ)

Theoremellimc3 23688* Write the epsilon-delta definition of a limit. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ℂ)       (𝜑 → (𝐶 ∈ (𝐹 lim 𝐵) ↔ (𝐶 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ+𝑧𝐴 ((𝑧𝐵 ∧ (abs‘(𝑧𝐵)) < 𝑦) → (abs‘((𝐹𝑧) − 𝐶)) < 𝑥))))

Theoremlimcflflem 23689 Lemma for limcflf 23690. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ((limPt‘𝐾)‘𝐴))    &   𝐾 = (TopOpen‘ℂfld)    &   𝐶 = (𝐴 ∖ {𝐵})    &   𝐿 = (((nei‘𝐾)‘{𝐵}) ↾t 𝐶)       (𝜑𝐿 ∈ (Fil‘𝐶))

Theoremlimcflf 23690 The limit operator can be expressed as a filter limit, from the filter of neighborhoods of 𝐵 restricted to 𝐴 ∖ {𝐵}, to the topology of the complex numbers. (If 𝐵 is not a limit point of 𝐴, then it is still formally a filter limit, but the neighborhood filter is not a proper filter in this case.) (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ((limPt‘𝐾)‘𝐴))    &   𝐾 = (TopOpen‘ℂfld)    &   𝐶 = (𝐴 ∖ {𝐵})    &   𝐿 = (((nei‘𝐾)‘{𝐵}) ↾t 𝐶)       (𝜑 → (𝐹 lim 𝐵) = ((𝐾 fLimf 𝐿)‘(𝐹𝐶)))

Theoremlimcmo 23691* If 𝐵 is a limit point of the domain of the function 𝐹, then there is at most one limit value of 𝐹 at 𝐵. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ((limPt‘𝐾)‘𝐴))    &   𝐾 = (TopOpen‘ℂfld)       (𝜑 → ∃*𝑥 𝑥 ∈ (𝐹 lim 𝐵))

Theoremlimcmpt 23692* Express the limit operator for a function defined by a mapping. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵 ∈ ℂ)    &   ((𝜑𝑧𝐴) → 𝐷 ∈ ℂ)    &   𝐽 = (𝐾t (𝐴 ∪ {𝐵}))    &   𝐾 = (TopOpen‘ℂfld)       (𝜑 → (𝐶 ∈ ((𝑧𝐴𝐷) lim 𝐵) ↔ (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝐶, 𝐷)) ∈ ((𝐽 CnP 𝐾)‘𝐵)))

Theoremlimcmpt2 23693* Express the limit operator for a function defined by a mapping. (Contributed by Mario Carneiro, 25-Dec-2016.)
(𝜑𝐴 ⊆ ℂ)    &   (𝜑𝐵𝐴)    &   ((𝜑 ∧ (𝑧𝐴𝑧𝐵)) → 𝐷 ∈ ℂ)    &   𝐽 = (𝐾t 𝐴)    &   𝐾 = (TopOpen‘ℂfld)       (𝜑 → (𝐶 ∈ ((𝑧 ∈ (𝐴 ∖ {𝐵}) ↦ 𝐷) lim 𝐵) ↔ (𝑧𝐴 ↦ if(𝑧 = 𝐵, 𝐶, 𝐷)) ∈ ((𝐽 CnP 𝐾)‘𝐵)))

Theoremlimcresi 23694 Any limit of 𝐹 is also a limit of the restriction of 𝐹. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝐹 lim 𝐵) ⊆ ((𝐹𝐶) lim 𝐵)

Theoremlimcres 23695 If 𝐵 is an interior point of 𝐶 ∪ {𝐵} relative to the domain 𝐴, then a limit point of 𝐹𝐶 extends to a limit of 𝐹. (Contributed by Mario Carneiro, 27-Dec-2016.)
(𝜑𝐹:𝐴⟶ℂ)    &   (𝜑𝐶𝐴)    &   (𝜑𝐴 ⊆ ℂ)    &   𝐾 = (TopOpen‘ℂfld)    &   𝐽 = (𝐾t (𝐴 ∪ {𝐵}))    &   (𝜑𝐵 ∈ ((int‘𝐽)‘(𝐶 ∪ {𝐵})))       (𝜑 → ((𝐹𝐶) lim 𝐵) = (𝐹 lim 𝐵))

Theoremcnplimc 23696 A function is continuous at 𝐵 iff its limit at 𝐵 equals the value of the function there. (Contributed by Mario Carneiro, 28-Dec-2016.)
𝐾 = (TopOpen‘ℂfld)    &   𝐽 = (𝐾t 𝐴)       ((𝐴 ⊆ ℂ ∧ 𝐵𝐴) → (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝐵) ↔ (𝐹:𝐴⟶ℂ ∧ (𝐹𝐵) ∈ (𝐹 lim 𝐵))))

Theoremcnlimc 23697* 𝐹 is a continuous function iff the limit of the function at each point equals the value of the function. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝐴 ⊆ ℂ → (𝐹 ∈ (𝐴cn→ℂ) ↔ (𝐹:𝐴⟶ℂ ∧ ∀𝑥𝐴 (𝐹𝑥) ∈ (𝐹 lim 𝑥))))

Theoremcnlimci 23698 If 𝐹 is a continuous function, then the limit of the function at any point equals its value. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝜑𝐹 ∈ (𝐴cn𝐷))    &   (𝜑𝐵𝐴)       (𝜑 → (𝐹𝐵) ∈ (𝐹 lim 𝐵))

Theoremcnmptlimc 23699* If 𝐹 is a continuous function, then the limit of the function at any point equals its value. (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝜑 → (𝑥𝐴𝑋) ∈ (𝐴cn𝐷))    &   (𝜑𝐵𝐴)    &   (𝑥 = 𝐵𝑋 = 𝑌)       (𝜑𝑌 ∈ ((𝑥𝐴𝑋) lim 𝐵))

Theoremlimccnp 23700 If the limit of 𝐹 at 𝐵 is 𝐶 and 𝐺 is continuous at 𝐶, then the limit of 𝐺𝐹 at 𝐵 is 𝐺(𝐶). (Contributed by Mario Carneiro, 28-Dec-2016.)
(𝜑𝐹:𝐴𝐷)    &   (𝜑𝐷 ⊆ ℂ)    &   𝐾 = (TopOpen‘ℂfld)    &   𝐽 = (𝐾t 𝐷)    &   (𝜑𝐶 ∈ (𝐹 lim 𝐵))    &   (𝜑𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐶))       (𝜑 → (𝐺𝐶) ∈ ((𝐺𝐹) lim 𝐵))

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