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Theorem List for Metamath Proof Explorer - 38201-38300   *Has distinct variable group(s)
TypeLabelDescription
Statement
 
Theoremrexanuz3 38201* Combine two different upper integer properties into one, for a single integer. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑗𝜑    &   𝑍 = (ℤ𝑀)    &   (𝜑 → ∃𝑗𝑍𝑘 ∈ (ℤ𝑗)𝜒)    &   (𝜑 → ∃𝑗𝑍𝑘 ∈ (ℤ𝑗)𝜓)    &   (𝑘 = 𝑗 → (𝜒𝜃))    &   (𝑘 = 𝑗 → (𝜓𝜏))       (𝜑 → ∃𝑗𝑍 (𝜃𝜏))
 
Theoremrabeqd 38202* Equality theorem for restricted class abstractions. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴 = 𝐵)       (𝜑 → {𝑥𝐴𝜒} = {𝑥𝐵𝜒})
 
Theoremcbvmpt22 38203* Rule to change the second bound variable in a maps-to function, using implicit substitution. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑦𝐴    &   𝑤𝐴    &   𝑤𝐶    &   𝑦𝐸    &   (𝑦 = 𝑤𝐶 = 𝐸)       (𝑥𝐴, 𝑦𝐵𝐶) = (𝑥𝐴, 𝑤𝐵𝐸)
 
Theoremcbvmpt21 38204* Rule to change the first bound variable in a maps-to function, using implicit substitution. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐵    &   𝑧𝐵    &   𝑧𝐶    &   𝑥𝐸    &   (𝑥 = 𝑧𝐶 = 𝐸)       (𝑥𝐴, 𝑦𝐵𝐶) = (𝑧𝐴, 𝑦𝐵𝐸)
 
Theoremeliuniin 38205* Indexed union of indexed intersections. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝐴 = 𝑥𝐵 𝑦𝐶 𝐷       (𝑍𝑉 → (𝑍𝐴 ↔ ∃𝑥𝐵𝑦𝐶 𝑍𝐷))
 
Theoremssabf 38206 Subclass of a class abstraction. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐴       (𝐴 ⊆ {𝑥𝜑} ↔ ∀𝑥(𝑥𝐴𝜑))
 
Theoremrabbia2 38207 Equivalent wff's yield equal restricted class abstractions. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
((𝑥𝐴𝜓) ↔ (𝑥𝐵𝜒))       {𝑥𝐴𝜓} = {𝑥𝐵𝜒}
 
Theoremuniexd 38208 Deduction version of the ZF Axiom of Union in class notation. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)       (𝜑 𝐴 ∈ V)
 
Theorempwexd 38209 Deduction version of the power set axiom. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)       (𝜑 → 𝒫 𝐴 ∈ V)
 
Theorempssnssi 38210 A proper subclass does not include the other class. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝐴𝐵        ¬ 𝐵𝐴
 
Theoremrabidim2 38211 Membership in a restricted abstraction, implication. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝑥 ∈ {𝑥𝐴𝜑} → 𝜑)
 
Theoremxpexd 38212 The Cartesian product of two sets is a set. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 → (𝐴 × 𝐵) ∈ V)
 
Theoremeluni2f 38213* Membership in class union. Restricted quantifier version. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐴    &   𝑥𝐵       (𝐴 𝐵 ↔ ∃𝑥𝐵 𝐴𝑥)
 
Theoremeliin2f 38214* Membership in indexed intersection. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐵       (𝐵 ≠ ∅ → (𝐴 𝑥𝐵 𝐶 ↔ ∀𝑥𝐵 𝐴𝐶))
 
Theoremnssd 38215 Negation of subclass relationship. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝑋𝐴)    &   (𝜑 → ¬ 𝑋𝐵)       (𝜑 → ¬ 𝐴𝐵)
 
Theoremrabidim1 38216 Membership in a restricted abstraction, implication. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝑥 ∈ {𝑥𝐴𝜑} → 𝑥𝐴)
 
Theoremiineq12dv 38217* Equality deduction for indexed intersection. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴 = 𝐵)    &   ((𝜑𝑥𝐵) → 𝐶 = 𝐷)       (𝜑 𝑥𝐴 𝐶 = 𝑥𝐵 𝐷)
 
Theoremrabeqif 38218 Equality theorem for restricted class abstractions. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐴    &   𝑥𝐵    &   𝐴 = 𝐵       {𝑥𝐴𝜑} = {𝑥𝐵𝜑}
 
Theoremsupxrcld 38219 The supremum of an arbitrary set of extended reals is an extended real. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴 ⊆ ℝ*)       (𝜑 → sup(𝐴, ℝ*, < ) ∈ ℝ*)
 
Theoremelrestd 38220 A sufficient condition for being an open set of a subspace topology. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐽𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝑋𝐽)    &   𝐴 = (𝑋𝐵)       (𝜑𝐴 ∈ (𝐽t 𝐵))
 
Theoremeliuniincex 38221* Counterexample to show that the additional conditions in eliuniin 38205 and eliuniin2 38233 are actually needed. Notice that the definition of 𝐴 is not even needed (it can be any class). (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝐵 = {∅}    &   𝐶 = ∅    &   𝐷 = ∅    &   𝑍 = V        ¬ (𝑍𝐴 ↔ ∃𝑥𝐵𝑦𝐶 𝑍𝐷)
 
Theoremeliincex 38222* Counterexample to show that the additional conditions in eliin 4359 and eliin2 38228 are actually needed. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝐴 = V    &   𝐵 = ∅        ¬ (𝐴 𝑥𝐵 𝐶 ↔ ∀𝑥𝐵 𝐴𝐶)
 
Theoremeliinid 38223* Membership in an indexed intersection implies membership in any intersected set. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
((𝐴 𝑥𝐵 𝐶𝑥𝐵) → 𝐴𝐶)
 
Theoremabssf 38224 Class abstraction in a subclass relationship. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐴       ({𝑥𝜑} ⊆ 𝐴 ↔ ∀𝑥(𝜑𝑥𝐴))
 
Theoremfexd 38225 If the domain of a mapping is a set, the function is a set. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐹:𝐴𝐵)    &   (𝜑𝐴𝐶)       (𝜑𝐹 ∈ V)
 
Theoremsupxrubd 38226 A member of a set of extended reals is less than or equal to the set's supremum. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴 ⊆ ℝ*)    &   (𝜑𝐵𝐴)    &   𝑆 = sup(𝐴, ℝ*, < )       (𝜑𝐵𝑆)
 
Theoremssrabf 38227 Subclass of a restricted class abstraction. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐵    &   𝑥𝐴       (𝐵 ⊆ {𝑥𝐴𝜑} ↔ (𝐵𝐴 ∧ ∀𝑥𝐵 𝜑))
 
Theoremeliin2 38228* Membership in indexed intersection. See eliincex 38222 for a counterexample showing that the precondition 𝐵 ≠ ∅ cannot be simply dropped. eliin 4359 uses an alternative precondition (and it doesn't have a disjoint var constraint between 𝐵 and 𝑥; see eliin2f 38214). (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝐵 ≠ ∅ → (𝐴 𝑥𝐵 𝐶 ↔ ∀𝑥𝐵 𝐴𝐶))
 
Theoremssrab2f 38229 Subclass relation for a restricted class. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐴       {𝑥𝐴𝜑} ⊆ 𝐴
 
Theoremrabeqi 38230* Equality theorem for restricted class abstractions. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝐴 = 𝐵       {𝑥𝐴𝜑} = {𝑥𝐵𝜑}
 
Theoremrestuni3 38231 The underlying set of a subspace induced by the subspace operator t. The result can be applied, for instance, to topologies and sigma-algebras. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 (𝐴t 𝐵) = ( 𝐴𝐵))
 
Theoremrabssf 38232 Restricted class abstraction in a subclass relationship. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐵       ({𝑥𝐴𝜑} ⊆ 𝐵 ↔ ∀𝑥𝐴 (𝜑𝑥𝐵))
 
Theoremeliuniin2 38233* Indexed union of indexed intersections. See eliincex 38222 for a counterexample showing that the precondition 𝐶 ≠ ∅ cannot be simply dropped. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑥𝐶    &   𝐴 = 𝑥𝐵 𝑦𝐶 𝐷       (𝐶 ≠ ∅ → (𝑍𝐴 ↔ ∃𝑥𝐵𝑦𝐶 𝑍𝐷))
 
Theoremrestuni4 38234 The underlying set of a subspace induced by the t operator. The result can be applied, for instance, to topologies and sigma-algebras. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵 𝐴)       (𝜑 (𝐴t 𝐵) = 𝐵)
 
Theoremrestuni6 38235 The underlying set of a subspace topology. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 (𝐴t 𝐵) = ( 𝐴𝐵))
 
Theoremrestuni5 38236 The underlying set of a subspace induced by the t operator. The result can be applied, for instance, to topologies and sigma-algebras. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
𝑋 = 𝐽       ((𝐽𝑉𝐴𝑋) → 𝐴 = (𝐽t 𝐴))
 
Theoremunirestss 38237 The union of an elementwise intersection is a subset of the underlying set. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 (𝐴t 𝐵) ⊆ 𝐴)
 
20.31.2  Functions
 
Theoremunima 38238 Image of a union. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
((𝐹 Fn 𝐴𝐵𝐴𝐶𝐴) → (𝐹 “ (𝐵𝐶)) = ((𝐹𝐵) ∪ (𝐹𝐶)))
 
Theoremfeq1dd 38239 Equality deduction for functions. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
(𝜑𝐹 = 𝐺)    &   (𝜑𝐹:𝐴𝐵)       (𝜑𝐺:𝐴𝐵)
 
Theoremfnresdmss 38240 A function does not change when restricted to a set that contains its domain. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
((𝐹 Fn 𝐴𝐴𝐵) → (𝐹𝐵) = 𝐹)
 
Theoremfmptsnxp 38241* Maps-to notation and cross product for a singleton function. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
((𝐴𝑉𝐵𝑊) → (𝑥 ∈ {𝐴} ↦ 𝐵) = ({𝐴} × {𝐵}))
 
Theoremmptex2 38242* If a class given as a map-to notation is a set, it's image values are set. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
(𝜑 → (𝑡𝐴𝐵):𝐴𝐶)       ((𝜑𝑡𝐴) → 𝐵𝐶)
 
Theoremfvmpt2bd 38243* Value of a function given by the "maps to" notation. Deduction version. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
(𝜑𝐹 = (𝑥𝐴𝐵))       ((𝜑𝑥𝐴𝐵𝐶) → (𝐹𝑥) = 𝐵)
 
Theoremrnmptfi 38244* The range of a function with finite domain is finite. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
𝐴 = (𝑥𝐵𝐶)       (𝐵 ∈ Fin → ran 𝐴 ∈ Fin)
 
Theoremfresin2 38245 Restriction of a function with respect to the intersection with its domain. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
(𝐹:𝐴𝐵 → (𝐹 ↾ (𝐶𝐴)) = (𝐹𝐶))
 
Theoremrnmptc 38246* Range of a constant function in map to notation. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
𝐹 = (𝑥𝐴𝐵)    &   ((𝜑𝑥𝐴) → 𝐵𝐶)    &   (𝜑𝐴 ≠ ∅)       (𝜑 → ran 𝐹 = {𝐵})
 
Theoremffi 38247 A function with finite domain is finite. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
((𝐹:𝐴𝐵𝐴 ∈ Fin) → 𝐹 ∈ Fin)
 
Theoremsuprnmpt 38248* An explicit bound for the range of a bounded function. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
(𝜑𝐴 ≠ ∅)    &   ((𝜑𝑥𝐴) → 𝐵 ∈ ℝ)    &   (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥𝐴 𝐵𝑦)    &   𝐹 = (𝑥𝐴𝐵)    &   𝐶 = sup(ran 𝐹, ℝ, < )       (𝜑 → (𝐶 ∈ ℝ ∧ ∀𝑥𝐴 𝐵𝐶))
 
Theoremrnffi 38249 The range of a function with finite domain is finite. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
((𝐹:𝐴𝐵𝐴 ∈ Fin) → ran 𝐹 ∈ Fin)
 
Theoremmptelpm 38250* A function in maps-to notation is a partial map . (Contributed by Glauco Siliprandi, 5-Apr-2020.)
((𝜑𝑥𝐴) → 𝐵𝐶)    &   (𝜑𝐴𝐷)    &   (𝜑𝐶𝑉)    &   (𝜑𝐷𝑊)       (𝜑 → (𝑥𝐴𝐵) ∈ (𝐶pm 𝐷))
 
Theoremrnmptpr 38251* Range of a function defined on an unordered pair. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   𝐹 = (𝑥 ∈ {𝐴, 𝐵} ↦ 𝐶)    &   (𝑥 = 𝐴𝐶 = 𝐷)    &   (𝑥 = 𝐵𝐶 = 𝐸)       (𝜑 → ran 𝐹 = {𝐷, 𝐸})
 
Theoremresmpti 38252* Restriction of the mapping operation. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝐵𝐴       ((𝑥𝐴𝐶) ↾ 𝐵) = (𝑥𝐵𝐶)
 
Theoremfouniiun 38253* Union expressed as an indexed union, when a map onto is given. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝐹:𝐴onto𝐵 𝐵 = 𝑥𝐴 (𝐹𝑥))
 
Theoremf1oeq2d 38254 Equality deduction for one-to-one onto functions. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐴 = 𝐵)       (𝜑 → (𝐹:𝐴1-1-onto𝐶𝐹:𝐵1-1-onto𝐶))
 
Theoremrnresun 38255 Distribution law for range of a restriction over a union. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
ran (𝐹 ↾ (𝐴𝐵)) = (ran (𝐹𝐴) ∪ ran (𝐹𝐵))
 
Theoremf1oeq1d 38256 Equality deduction for one-to-one onto functions. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐹 = 𝐺)       (𝜑 → (𝐹:𝐴1-1-onto𝐵𝐺:𝐴1-1-onto𝐵))
 
Theoremdffo3f 38257* An onto mapping expressed in terms of function values. As dffo3 6166 but with less disjoint vars constraints. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝐹       (𝐹:𝐴onto𝐵 ↔ (𝐹:𝐴𝐵 ∧ ∀𝑦𝐵𝑥𝐴 𝑦 = (𝐹𝑥)))
 
Theoremrnresss 38258 The range of a restriction is a subset of the whole range. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
ran (𝐴𝐵) ⊆ ran 𝐴
 
Theoremelrnmptd 38259* The range of a function in maps-to notation. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝐹 = (𝑥𝐴𝐵)    &   (𝜑 → ∃𝑥𝐴 𝐶 = 𝐵)    &   (𝜑𝐶𝑉)       (𝜑𝐶 ∈ ran 𝐹)
 
Theoremelrnmptf 38260 The range of a function in maps-to notation. Same as elrnmpt 5184, but using bound-variable hypotheses instead of distinct variable conditions. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝐶    &   𝐹 = (𝑥𝐴𝐵)       (𝐶𝑉 → (𝐶 ∈ ran 𝐹 ↔ ∃𝑥𝐴 𝐶 = 𝐵))
 
Theoremrnmptssrn 38261* Inclusion relation for two ranges expressed in map-to notation. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   ((𝜑𝑥𝐴) → ∃𝑦𝐶 𝐵 = 𝐷)       (𝜑 → ran (𝑥𝐴𝐵) ⊆ ran (𝑦𝐶𝐷))
 
Theoremdisjf1 38262* A 1 to 1 mapping built from disjoint, nonempty sets . (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝜑    &   𝐹 = (𝑥𝐴𝐵)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   ((𝜑𝑥𝐴) → 𝐵 ≠ ∅)    &   (𝜑Disj 𝑥𝐴 𝐵)       (𝜑𝐹:𝐴1-1𝑉)
 
Theoremrnsnf 38263 The range of a function whose domain is a singleton. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐴𝑉)    &   (𝜑𝐹:{𝐴}⟶𝐵)       (𝜑 → ran 𝐹 = {(𝐹𝐴)})
 
Theoremwessf1ornlem 38264* Given a function 𝐹 on a well ordered domain 𝐴 there exists a subset of 𝐴 such that 𝐹 restricted to such subset is injective and onto the range of 𝐹 (without using the axiom of choice). (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐹 Fn 𝐴)    &   (𝜑𝐴𝑉)    &   (𝜑𝑅 We 𝐴)    &   𝐺 = (𝑦 ∈ ran 𝐹 ↦ (𝑥 ∈ (𝐹 “ {𝑦})∀𝑧 ∈ (𝐹 “ {𝑦}) ¬ 𝑧𝑅𝑥))       (𝜑 → ∃𝑥 ∈ 𝒫 𝐴(𝐹𝑥):𝑥1-1-onto→ran 𝐹)
 
Theoremwessf1orn 38265* Given a function 𝐹 on a well ordered domain 𝐴 there exists a subset of 𝐴 such that 𝐹 restricted to such subset is injective and onto the range of 𝐹 (without using the axiom of choice). (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝜑𝐹 Fn 𝐴)    &   (𝜑𝐴𝑉)    &   (𝜑𝑅 We 𝐴)       (𝜑 → ∃𝑥 ∈ 𝒫 𝐴(𝐹𝑥):𝑥1-1-onto→ran 𝐹)
 
Theoremfoelrnf 38266* Property of a surjective function. As foelrn 6170 but with less disjoint vars constraints. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝐹       ((𝐹:𝐴onto𝐵𝐶𝐵) → ∃𝑥𝐴 𝐶 = (𝐹𝑥))
 
Theoremnelrnres 38267 If 𝐴 is not in the range, it is not in the range of any restriction. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝐴 ∈ ran 𝐵 → ¬ 𝐴 ∈ ran (𝐵𝐶))
 
Theoremdisjrnmpt2 38268* Disjointness of the range of a function in map-to notation. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝐹 = (𝑥𝐴𝐵)       (Disj 𝑥𝐴 𝐵Disj 𝑦 ∈ ran 𝐹 𝑦)
 
Theoremelrnmpt1sf 38269* Elementhood in an image set. Same as elrnmpt1s 5185, but using bound-variable hypotheses instead of distinct variable conditions. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝐶    &   𝐹 = (𝑥𝐴𝐵)    &   (𝑥 = 𝐷𝐵 = 𝐶)       ((𝐷𝐴𝐶𝑉) → 𝐶 ∈ ran 𝐹)
 
Theoremfouniiun0 38270* Union expressed as an indexed union, when a map onto is given. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
(𝐹:𝐴onto→(𝐵 ∪ {∅}) → 𝐵 = 𝑥𝐴 (𝐹𝑥))
 
Theoremdisjf1o 38271* A bijection built from disjoint sets. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝑥𝜑    &   𝐹 = (𝑥𝐴𝐵)    &   ((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑Disj 𝑥𝐴 𝐵)    &   𝐶 = {𝑥𝐴𝐵 ≠ ∅}    &   𝐷 = (ran 𝐹 ∖ {∅})       (𝜑 → (𝐹𝐶):𝐶1-1-onto𝐷)
 
Theoremfompt 38272* Express being onto for a mapping operation. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
𝐹 = (𝑥𝐴𝐶)       (𝐹:𝐴onto𝐵 ↔ (∀𝑥𝐴 𝐶𝐵 ∧ ∀𝑦𝐵𝑥𝐴 𝑦 = 𝐶))
 
Theoremdisjinfi 38273* Only a finite number of disjoint sets can have a non empty intersection with a finite set 𝐶 (Contributed by Glauco Siliprandi, 17-Aug-2020.)
((𝜑𝑥𝐴) → 𝐵𝑉)    &   (𝜑Disj 𝑥𝐴 𝐵)    &   (𝜑𝐶 ∈ Fin)       (𝜑 → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ∈ Fin)
 
Theoremfvovco 38274 Value of the composition of an operator, with a given function. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
(𝜑𝐹:𝑋⟶(𝑉 × 𝑊))    &   (𝜑𝑌𝑋)       (𝜑 → ((𝑂𝐹)‘𝑌) = ((1st ‘(𝐹𝑌))𝑂(2nd ‘(𝐹𝑌))))
 
Theoremssnnf1octb 38275* There exists a bijection between a subset of and a given nonempty countable set. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
((𝐴 ≼ ω ∧ 𝐴 ≠ ∅) → ∃𝑓(dom 𝑓 ⊆ ℕ ∧ 𝑓:dom 𝑓1-1-onto𝐴))
 
Theoremmapdm0 38276 The empty set is the only map with empty domain. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
(𝐴𝑉 → (𝐴𝑚 ∅) = {∅})
 
Theoremnnf1oxpnn 38277 There is a bijection between the set of positive integers and the Cartesian product of the set of positive integers with itself. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
𝑓 𝑓:ℕ–1-1-onto→(ℕ × ℕ)
 
Theoremrnmptssd 38278* The range of an operation given by the "maps to" notation as a subset. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
𝑥𝜑    &   𝐹 = (𝑥𝐴𝐵)    &   ((𝜑𝑥𝐴) → 𝐵𝐶)       (𝜑 → ran 𝐹𝐶)
 
Theoremprojf1o 38279* A biijection from a set to a projection in a two dimensional space. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
(𝜑𝐴𝑉)    &   𝐹 = (𝑥𝐵 ↦ ⟨𝐴, 𝑥⟩)       (𝜑𝐹:𝐵1-1-onto→({𝐴} × 𝐵))
 
Theoremfvmap 38280 Function value for a member of a set exponentiation. (Contributed by Glauco Siliprandi, 21-Nov-2020.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐹 ∈ (𝐴𝑚 𝐵))    &   (𝜑𝐶𝐵)       (𝜑 → (𝐹𝐶) ∈ 𝐴)
 
Theoremmapsnd 38281* The value of set exponentiation with a singleton exponent. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 → (𝐴𝑚 {𝐵}) = {𝑓 ∣ ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩}})
 
Theoremfvixp2 38282* Projection of a factor of an indexed Cartesian product. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
((𝐹X𝑥𝐴 𝐵𝑥𝐴) → (𝐹𝑥) ∈ 𝐵)
 
Theoremfidmfisupp 38283 A function with a finite domain is finitely supported. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
(𝜑𝐹:𝐷𝑅)    &   (𝜑𝐷 ∈ Fin)    &   (𝜑𝑍𝑉)       (𝜑𝐹 finSupp 𝑍)
 
Theoremmapsnend 38284 Set exponentiation to a singleton exponent is equinumerous to its base. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)       (𝜑 → (𝐴𝑚 {𝐵}) ≈ 𝐴)
 
Theoremchoicefi 38285* For a finite set, a choice function exists, without using the axiom of choice. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
(𝜑𝐴 ∈ Fin)    &   ((𝜑𝑥𝐴) → 𝐵𝑊)    &   ((𝜑𝑥𝐴) → 𝐵 ≠ ∅)       (𝜑 → ∃𝑓(𝑓 Fn 𝐴 ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵))
 
Theoremmpct 38286 The exponentiation of a countable set to a finite set is countable. (Contributed by Glauco Siliprandi, 24-Dec-2020.)
(𝜑𝐴 ≼ ω)    &   (𝜑𝐵 ∈ Fin)       (𝜑 → (𝐴𝑚 𝐵) ≼ ω)
 
Theoremcnmetcoval 38287 Value of the distance function of the metric space of complex numbers, composed with a function. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
𝐷 = (abs ∘ − )    &   (𝜑𝐹:𝐴⟶(ℂ × ℂ))    &   (𝜑𝐵𝐴)       (𝜑 → ((𝐷𝐹)‘𝐵) = (abs‘((1st ‘(𝐹𝐵)) − (2nd ‘(𝐹𝐵)))))
 
Theoremfcomptss 38288* Express composition of two functions as a maps-to applying both in sequence. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐹:𝐴𝐵)    &   (𝜑𝐵𝐶)    &   (𝜑𝐺:𝐶𝐷)       (𝜑 → (𝐺𝐹) = (𝑥𝐴 ↦ (𝐺‘(𝐹𝑥))))
 
Theoremelmapsnd 38289 Membership in a set exponentiated to a singleton. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐹 Fn {𝐴})    &   (𝜑𝐵𝑉)    &   (𝜑 → (𝐹𝐴) ∈ 𝐵)       (𝜑𝐹 ∈ (𝐵𝑚 {𝐴}))
 
Theoremmapss2 38290 Subset inheritance for set exponentiation. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐶𝑍)    &   (𝜑𝐶 ≠ ∅)       (𝜑 → (𝐴𝐵 ↔ (𝐴𝑚 𝐶) ⊆ (𝐵𝑚 𝐶)))
 
Theoremfsneq 38291 Equality condition for two functions defined on a singleton. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   𝐵 = {𝐴}    &   (𝜑𝐹 Fn 𝐵)    &   (𝜑𝐺 Fn 𝐵)       (𝜑 → (𝐹 = 𝐺 ↔ (𝐹𝐴) = (𝐺𝐴)))
 
Theoremdifmap 38292 Difference of two sets exponentiations. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐶𝑍)    &   (𝜑𝐶 ≠ ∅)       (𝜑 → ((𝐴𝐵) ↑𝑚 𝐶) ⊆ ((𝐴𝑚 𝐶) ∖ (𝐵𝑚 𝐶)))
 
Theoremunirnmap 38293 Given a subset of a set exponentiation, the base set can be restricted. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝑋 ⊆ (𝐵𝑚 𝐴))       (𝜑𝑋 ⊆ (ran 𝑋𝑚 𝐴))
 
Theoreminmap 38294 Intersection of two sets exponentiations. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐶𝑍)       (𝜑 → ((𝐴𝑚 𝐶) ∩ (𝐵𝑚 𝐶)) = ((𝐴𝐵) ↑𝑚 𝐶))
 
Theoremfcoss 38295 Composition of two mappings. Similar to fco 5856, but with a weaker condition on the domain of 𝐹. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐹:𝐴𝐵)    &   (𝜑𝐶𝐴)    &   (𝜑𝐺:𝐷𝐶)       (𝜑 → (𝐹𝐺):𝐷𝐵)
 
Theoremfsneqrn 38296 Equality condition for two functions defined on a singleton. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   𝐵 = {𝐴}    &   (𝜑𝐹 Fn 𝐵)    &   (𝜑𝐺 Fn 𝐵)       (𝜑 → (𝐹 = 𝐺 ↔ (𝐹𝐴) ∈ ran 𝐺))
 
Theoremdifmapsn 38297 Difference of two sets exponentiatiated to a singleton. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐶𝑍)       (𝜑 → ((𝐴𝑚 {𝐶}) ∖ (𝐵𝑚 {𝐶})) = ((𝐴𝐵) ↑𝑚 {𝐶}))
 
Theoremmapssbi 38298 Subset inheritance for set exponentiation. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   (𝜑𝐶𝑍)    &   (𝜑𝐶 ≠ ∅)       (𝜑 → (𝐴𝐵 ↔ (𝐴𝑚 𝐶) ⊆ (𝐵𝑚 𝐶)))
 
Theoremunirnmapsn 38299 Equality theorem for a subset of a set exponentiation, where the exponent is a singleton. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
(𝜑𝐴𝑉)    &   (𝜑𝐵𝑊)    &   𝐶 = {𝐴}    &   (𝜑𝑋 ⊆ (𝐵𝑚 𝐶))       (𝜑𝑋 = (ran 𝑋𝑚 𝐶))
 
Theoremiunmapss 38300* The indexed union of set exponentiations is a subset of the set exponentiation of the indexed union. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
𝑥𝜑    &   (𝜑𝐴𝑉)    &   ((𝜑𝑥𝐴) → 𝐵𝑊)       (𝜑 𝑥𝐴 (𝐵𝑚 𝐶) ⊆ ( 𝑥𝐴 𝐵𝑚 𝐶))
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