Theorem List for Intuitionistic Logic Explorer - 5201-5300 *Has distinct variable
group(s)
Type | Label | Description |
Statement |
|
Theorem | fun11uni 5201* |
The union of a chain (with respect to inclusion) of one-to-one functions
is a one-to-one function. (Contributed by NM, 11-Aug-2004.)
|
⊢ (∀𝑓 ∈ 𝐴 ((Fun 𝑓 ∧ Fun ◡𝑓) ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → (Fun ∪
𝐴 ∧ Fun ◡∪ 𝐴)) |
|
Theorem | funin 5202 |
The intersection with a function is a function. Exercise 14(a) of
[Enderton] p. 53. (Contributed by NM,
19-Mar-2004.) (Proof shortened by
Andrew Salmon, 17-Sep-2011.)
|
⊢ (Fun 𝐹 → Fun (𝐹 ∩ 𝐺)) |
|
Theorem | funres11 5203 |
The restriction of a one-to-one function is one-to-one. (Contributed by
NM, 25-Mar-1998.)
|
⊢ (Fun ◡𝐹 → Fun ◡(𝐹 ↾ 𝐴)) |
|
Theorem | funcnvres 5204 |
The converse of a restricted function. (Contributed by NM,
27-Mar-1998.)
|
⊢ (Fun ◡𝐹 → ◡(𝐹 ↾ 𝐴) = (◡𝐹 ↾ (𝐹 “ 𝐴))) |
|
Theorem | cnvresid 5205 |
Converse of a restricted identity function. (Contributed by FL,
4-Mar-2007.)
|
⊢ ◡( I
↾ 𝐴) = ( I ↾
𝐴) |
|
Theorem | funcnvres2 5206 |
The converse of a restriction of the converse of a function equals the
function restricted to the image of its converse. (Contributed by NM,
4-May-2005.)
|
⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (𝐹 ↾ (◡𝐹 “ 𝐴))) |
|
Theorem | funimacnv 5207 |
The image of the preimage of a function. (Contributed by NM,
25-May-2004.)
|
⊢ (Fun 𝐹 → (𝐹 “ (◡𝐹 “ 𝐴)) = (𝐴 ∩ ran 𝐹)) |
|
Theorem | funimass1 5208 |
A kind of contraposition law that infers a subclass of an image from a
preimage subclass. (Contributed by NM, 25-May-2004.)
|
⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ ran 𝐹) → ((◡𝐹 “ 𝐴) ⊆ 𝐵 → 𝐴 ⊆ (𝐹 “ 𝐵))) |
|
Theorem | funimass2 5209 |
A kind of contraposition law that infers an image subclass from a subclass
of a preimage. (Contributed by NM, 25-May-2004.)
|
⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ (◡𝐹 “ 𝐵)) → (𝐹 “ 𝐴) ⊆ 𝐵) |
|
Theorem | imadiflem 5210 |
One direction of imadif 5211. This direction does not require
Fun ◡𝐹. (Contributed by Jim
Kingdon, 25-Dec-2018.)
|
⊢ ((𝐹 “ 𝐴) ∖ (𝐹 “ 𝐵)) ⊆ (𝐹 “ (𝐴 ∖ 𝐵)) |
|
Theorem | imadif 5211 |
The image of a difference is the difference of images. (Contributed by
NM, 24-May-1998.)
|
⊢ (Fun ◡𝐹 → (𝐹 “ (𝐴 ∖ 𝐵)) = ((𝐹 “ 𝐴) ∖ (𝐹 “ 𝐵))) |
|
Theorem | imainlem 5212 |
One direction of imain 5213. This direction does not require
Fun ◡𝐹. (Contributed by Jim
Kingdon, 25-Dec-2018.)
|
⊢ (𝐹 “ (𝐴 ∩ 𝐵)) ⊆ ((𝐹 “ 𝐴) ∩ (𝐹 “ 𝐵)) |
|
Theorem | imain 5213 |
The image of an intersection is the intersection of images.
(Contributed by Paul Chapman, 11-Apr-2009.)
|
⊢ (Fun ◡𝐹 → (𝐹 “ (𝐴 ∩ 𝐵)) = ((𝐹 “ 𝐴) ∩ (𝐹 “ 𝐵))) |
|
Theorem | funimaexglem 5214 |
Lemma for funimaexg 5215. It constitutes the interesting part of
funimaexg 5215, in which 𝐵 ⊆ dom 𝐴. (Contributed by Jim Kingdon,
27-Dec-2018.)
|
⊢ ((Fun 𝐴 ∧ 𝐵 ∈ 𝐶 ∧ 𝐵 ⊆ dom 𝐴) → (𝐴 “ 𝐵) ∈ V) |
|
Theorem | funimaexg 5215 |
Axiom of Replacement using abbreviations. Axiom 39(vi) of [Quine] p. 284.
Compare Exercise 9 of [TakeutiZaring] p. 29. (Contributed by NM,
10-Sep-2006.)
|
⊢ ((Fun 𝐴 ∧ 𝐵 ∈ 𝐶) → (𝐴 “ 𝐵) ∈ V) |
|
Theorem | funimaex 5216 |
The image of a set under any function is also a set. Equivalent of
Axiom of Replacement. Axiom 39(vi) of [Quine] p. 284. Compare Exercise
9 of [TakeutiZaring] p. 29.
(Contributed by NM, 17-Nov-2002.)
|
⊢ 𝐵 ∈ V ⇒ ⊢ (Fun 𝐴 → (𝐴 “ 𝐵) ∈ V) |
|
Theorem | isarep1 5217* |
Part of a study of the Axiom of Replacement used by the Isabelle prover.
The object PrimReplace is apparently the image of the function encoded
by 𝜑(𝑥, 𝑦) i.e. the class ({〈𝑥, 𝑦〉 ∣ 𝜑} “ 𝐴).
If so, we can prove Isabelle's "Axiom of Replacement"
conclusion without
using the Axiom of Replacement, for which I (N. Megill) currently have
no explanation. (Contributed by NM, 26-Oct-2006.) (Proof shortened by
Mario Carneiro, 4-Dec-2016.)
|
⊢ (𝑏 ∈ ({〈𝑥, 𝑦〉 ∣ 𝜑} “ 𝐴) ↔ ∃𝑥 ∈ 𝐴 [𝑏 / 𝑦]𝜑) |
|
Theorem | isarep2 5218* |
Part of a study of the Axiom of Replacement used by the Isabelle prover.
In Isabelle, the sethood of PrimReplace is apparently postulated
implicitly by its type signature "[ i,
[ i, i ] => o ]
=> i", which automatically asserts that it is a set without
using any
axioms. To prove that it is a set in Metamath, we need the hypotheses
of Isabelle's "Axiom of Replacement" as well as the Axiom of
Replacement
in the form funimaex 5216. (Contributed by NM, 26-Oct-2006.)
|
⊢ 𝐴 ∈ V & ⊢ ∀𝑥 ∈ 𝐴 ∀𝑦∀𝑧((𝜑 ∧ [𝑧 / 𝑦]𝜑) → 𝑦 = 𝑧) ⇒ ⊢ ∃𝑤 𝑤 = ({〈𝑥, 𝑦〉 ∣ 𝜑} “ 𝐴) |
|
Theorem | fneq1 5219 |
Equality theorem for function predicate with domain. (Contributed by NM,
1-Aug-1994.)
|
⊢ (𝐹 = 𝐺 → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐴)) |
|
Theorem | fneq2 5220 |
Equality theorem for function predicate with domain. (Contributed by NM,
1-Aug-1994.)
|
⊢ (𝐴 = 𝐵 → (𝐹 Fn 𝐴 ↔ 𝐹 Fn 𝐵)) |
|
Theorem | fneq1d 5221 |
Equality deduction for function predicate with domain. (Contributed by
Paul Chapman, 22-Jun-2011.)
|
⊢ (𝜑 → 𝐹 = 𝐺) ⇒ ⊢ (𝜑 → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐴)) |
|
Theorem | fneq2d 5222 |
Equality deduction for function predicate with domain. (Contributed by
Paul Chapman, 22-Jun-2011.)
|
⊢ (𝜑 → 𝐴 = 𝐵) ⇒ ⊢ (𝜑 → (𝐹 Fn 𝐴 ↔ 𝐹 Fn 𝐵)) |
|
Theorem | fneq12d 5223 |
Equality deduction for function predicate with domain. (Contributed by
NM, 26-Jun-2011.)
|
⊢ (𝜑 → 𝐹 = 𝐺)
& ⊢ (𝜑 → 𝐴 = 𝐵) ⇒ ⊢ (𝜑 → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐵)) |
|
Theorem | fneq12 5224 |
Equality theorem for function predicate with domain. (Contributed by
Thierry Arnoux, 31-Jan-2017.)
|
⊢ ((𝐹 = 𝐺 ∧ 𝐴 = 𝐵) → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐵)) |
|
Theorem | fneq1i 5225 |
Equality inference for function predicate with domain. (Contributed by
Paul Chapman, 22-Jun-2011.)
|
⊢ 𝐹 = 𝐺 ⇒ ⊢ (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐴) |
|
Theorem | fneq2i 5226 |
Equality inference for function predicate with domain. (Contributed by
NM, 4-Sep-2011.)
|
⊢ 𝐴 = 𝐵 ⇒ ⊢ (𝐹 Fn 𝐴 ↔ 𝐹 Fn 𝐵) |
|
Theorem | nffn 5227 |
Bound-variable hypothesis builder for a function with domain.
(Contributed by NM, 30-Jan-2004.)
|
⊢ Ⅎ𝑥𝐹
& ⊢ Ⅎ𝑥𝐴 ⇒ ⊢ Ⅎ𝑥 𝐹 Fn 𝐴 |
|
Theorem | fnfun 5228 |
A function with domain is a function. (Contributed by NM, 1-Aug-1994.)
|
⊢ (𝐹 Fn 𝐴 → Fun 𝐹) |
|
Theorem | fnrel 5229 |
A function with domain is a relation. (Contributed by NM, 1-Aug-1994.)
|
⊢ (𝐹 Fn 𝐴 → Rel 𝐹) |
|
Theorem | fndm 5230 |
The domain of a function. (Contributed by NM, 2-Aug-1994.)
|
⊢ (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴) |
|
Theorem | funfni 5231 |
Inference to convert a function and domain antecedent. (Contributed by
NM, 22-Apr-2004.)
|
⊢ ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → 𝜑) ⇒ ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝜑) |
|
Theorem | fndmu 5232 |
A function has a unique domain. (Contributed by NM, 11-Aug-1994.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐹 Fn 𝐵) → 𝐴 = 𝐵) |
|
Theorem | fnbr 5233 |
The first argument of binary relation on a function belongs to the
function's domain. (Contributed by NM, 7-May-2004.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐵𝐹𝐶) → 𝐵 ∈ 𝐴) |
|
Theorem | fnop 5234 |
The first argument of an ordered pair in a function belongs to the
function's domain. (Contributed by NM, 8-Aug-1994.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 〈𝐵, 𝐶〉 ∈ 𝐹) → 𝐵 ∈ 𝐴) |
|
Theorem | fneu 5235* |
There is exactly one value of a function. (Contributed by NM,
22-Apr-2004.) (Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ∃!𝑦 𝐵𝐹𝑦) |
|
Theorem | fneu2 5236* |
There is exactly one value of a function. (Contributed by NM,
7-Nov-1995.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ∈ 𝐴) → ∃!𝑦〈𝐵, 𝑦〉 ∈ 𝐹) |
|
Theorem | fnun 5237 |
The union of two functions with disjoint domains. (Contributed by NM,
22-Sep-2004.)
|
⊢ (((𝐹 Fn 𝐴 ∧ 𝐺 Fn 𝐵) ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐹 ∪ 𝐺) Fn (𝐴 ∪ 𝐵)) |
|
Theorem | fnunsn 5238 |
Extension of a function with a new ordered pair. (Contributed by NM,
28-Sep-2013.) (Revised by Mario Carneiro, 30-Apr-2015.)
|
⊢ (𝜑 → 𝑋 ∈ V) & ⊢ (𝜑 → 𝑌 ∈ V) & ⊢ (𝜑 → 𝐹 Fn 𝐷)
& ⊢ 𝐺 = (𝐹 ∪ {〈𝑋, 𝑌〉}) & ⊢ 𝐸 = (𝐷 ∪ {𝑋}) & ⊢ (𝜑 → ¬ 𝑋 ∈ 𝐷) ⇒ ⊢ (𝜑 → 𝐺 Fn 𝐸) |
|
Theorem | fnco 5239 |
Composition of two functions. (Contributed by NM, 22-May-2006.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐺 Fn 𝐵 ∧ ran 𝐺 ⊆ 𝐴) → (𝐹 ∘ 𝐺) Fn 𝐵) |
|
Theorem | fnresdm 5240 |
A function does not change when restricted to its domain. (Contributed by
NM, 5-Sep-2004.)
|
⊢ (𝐹 Fn 𝐴 → (𝐹 ↾ 𝐴) = 𝐹) |
|
Theorem | fnresdisj 5241 |
A function restricted to a class disjoint with its domain is empty.
(Contributed by NM, 23-Sep-2004.)
|
⊢ (𝐹 Fn 𝐴 → ((𝐴 ∩ 𝐵) = ∅ ↔ (𝐹 ↾ 𝐵) = ∅)) |
|
Theorem | 2elresin 5242 |
Membership in two functions restricted by each other's domain.
(Contributed by NM, 8-Aug-1994.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐺 Fn 𝐵) → ((〈𝑥, 𝑦〉 ∈ 𝐹 ∧ 〈𝑥, 𝑧〉 ∈ 𝐺) ↔ (〈𝑥, 𝑦〉 ∈ (𝐹 ↾ (𝐴 ∩ 𝐵)) ∧ 〈𝑥, 𝑧〉 ∈ (𝐺 ↾ (𝐴 ∩ 𝐵))))) |
|
Theorem | fnssresb 5243 |
Restriction of a function with a subclass of its domain. (Contributed by
NM, 10-Oct-2007.)
|
⊢ (𝐹 Fn 𝐴 → ((𝐹 ↾ 𝐵) Fn 𝐵 ↔ 𝐵 ⊆ 𝐴)) |
|
Theorem | fnssres 5244 |
Restriction of a function with a subclass of its domain. (Contributed by
NM, 2-Aug-1994.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ⊆ 𝐴) → (𝐹 ↾ 𝐵) Fn 𝐵) |
|
Theorem | fnresin1 5245 |
Restriction of a function's domain with an intersection. (Contributed by
NM, 9-Aug-1994.)
|
⊢ (𝐹 Fn 𝐴 → (𝐹 ↾ (𝐴 ∩ 𝐵)) Fn (𝐴 ∩ 𝐵)) |
|
Theorem | fnresin2 5246 |
Restriction of a function's domain with an intersection. (Contributed by
NM, 9-Aug-1994.)
|
⊢ (𝐹 Fn 𝐴 → (𝐹 ↾ (𝐵 ∩ 𝐴)) Fn (𝐵 ∩ 𝐴)) |
|
Theorem | fnres 5247* |
An equivalence for functionality of a restriction. Compare dffun8 5159.
(Contributed by Mario Carneiro, 20-May-2015.)
|
⊢ ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ ∀𝑥 ∈ 𝐴 ∃!𝑦 𝑥𝐹𝑦) |
|
Theorem | fnresi 5248 |
Functionality and domain of restricted identity. (Contributed by NM,
27-Aug-2004.)
|
⊢ ( I ↾ 𝐴) Fn 𝐴 |
|
Theorem | fnima 5249 |
The image of a function's domain is its range. (Contributed by NM,
4-Nov-2004.) (Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ (𝐹 Fn 𝐴 → (𝐹 “ 𝐴) = ran 𝐹) |
|
Theorem | fn0 5250 |
A function with empty domain is empty. (Contributed by NM, 15-Apr-1998.)
(Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ (𝐹 Fn ∅ ↔ 𝐹 = ∅) |
|
Theorem | fnimadisj 5251 |
A class that is disjoint with the domain of a function has an empty image
under the function. (Contributed by FL, 24-Jan-2007.)
|
⊢ ((𝐹 Fn 𝐴 ∧ (𝐴 ∩ 𝐶) = ∅) → (𝐹 “ 𝐶) = ∅) |
|
Theorem | fnimaeq0 5252 |
Images under a function never map nonempty sets to empty sets.
(Contributed by Stefan O'Rear, 21-Jan-2015.)
|
⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ⊆ 𝐴) → ((𝐹 “ 𝐵) = ∅ ↔ 𝐵 = ∅)) |
|
Theorem | dfmpt3 5253 |
Alternate definition for the maps-to notation df-mpt 3999. (Contributed
by Mario Carneiro, 30-Dec-2016.)
|
⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = ∪
𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) |
|
Theorem | fnopabg 5254* |
Functionality and domain of an ordered-pair class abstraction.
(Contributed by NM, 30-Jan-2004.) (Proof shortened by Mario Carneiro,
4-Dec-2016.)
|
⊢ 𝐹 = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} ⇒ ⊢ (∀𝑥 ∈ 𝐴 ∃!𝑦𝜑 ↔ 𝐹 Fn 𝐴) |
|
Theorem | fnopab 5255* |
Functionality and domain of an ordered-pair class abstraction.
(Contributed by NM, 5-Mar-1996.)
|
⊢ (𝑥 ∈ 𝐴 → ∃!𝑦𝜑)
& ⊢ 𝐹 = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} ⇒ ⊢ 𝐹 Fn 𝐴 |
|
Theorem | mptfng 5256* |
The maps-to notation defines a function with domain. (Contributed by
Scott Fenton, 21-Mar-2011.)
|
⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) ⇒ ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ V ↔ 𝐹 Fn 𝐴) |
|
Theorem | fnmpt 5257* |
The maps-to notation defines a function with domain. (Contributed by
NM, 9-Apr-2013.)
|
⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) ⇒ ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝑉 → 𝐹 Fn 𝐴) |
|
Theorem | mpt0 5258 |
A mapping operation with empty domain. (Contributed by Mario Carneiro,
28-Dec-2014.)
|
⊢ (𝑥 ∈ ∅ ↦ 𝐴) = ∅ |
|
Theorem | fnmpti 5259* |
Functionality and domain of an ordered-pair class abstraction.
(Contributed by NM, 29-Jan-2004.) (Revised by Mario Carneiro,
31-Aug-2015.)
|
⊢ 𝐵 ∈ V & ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) ⇒ ⊢ 𝐹 Fn 𝐴 |
|
Theorem | dmmpti 5260* |
Domain of an ordered-pair class abstraction that specifies a function.
(Contributed by NM, 6-Sep-2005.) (Revised by Mario Carneiro,
31-Aug-2015.)
|
⊢ 𝐵 ∈ V & ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) ⇒ ⊢ dom 𝐹 = 𝐴 |
|
Theorem | dmmptd 5261* |
The domain of the mapping operation, deduction form. (Contributed by
Glauco Siliprandi, 11-Dec-2019.)
|
⊢ 𝐴 = (𝑥 ∈ 𝐵 ↦ 𝐶)
& ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐶 ∈ 𝑉) ⇒ ⊢ (𝜑 → dom 𝐴 = 𝐵) |
|
Theorem | mptun 5262 |
Union of mappings which are mutually compatible. (Contributed by Mario
Carneiro, 31-Aug-2015.)
|
⊢ (𝑥 ∈ (𝐴 ∪ 𝐵) ↦ 𝐶) = ((𝑥 ∈ 𝐴 ↦ 𝐶) ∪ (𝑥 ∈ 𝐵 ↦ 𝐶)) |
|
Theorem | feq1 5263 |
Equality theorem for functions. (Contributed by NM, 1-Aug-1994.)
|
⊢ (𝐹 = 𝐺 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) |
|
Theorem | feq2 5264 |
Equality theorem for functions. (Contributed by NM, 1-Aug-1994.)
|
⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) |
|
Theorem | feq3 5265 |
Equality theorem for functions. (Contributed by NM, 1-Aug-1994.)
|
⊢ (𝐴 = 𝐵 → (𝐹:𝐶⟶𝐴 ↔ 𝐹:𝐶⟶𝐵)) |
|
Theorem | feq23 5266 |
Equality theorem for functions. (Contributed by FL, 14-Jul-2007.) (Proof
shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ ((𝐴 = 𝐶 ∧ 𝐵 = 𝐷) → (𝐹:𝐴⟶𝐵 ↔ 𝐹:𝐶⟶𝐷)) |
|
Theorem | feq1d 5267 |
Equality deduction for functions. (Contributed by NM, 19-Feb-2008.)
|
⊢ (𝜑 → 𝐹 = 𝐺) ⇒ ⊢ (𝜑 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) |
|
Theorem | feq2d 5268 |
Equality deduction for functions. (Contributed by Paul Chapman,
22-Jun-2011.)
|
⊢ (𝜑 → 𝐴 = 𝐵) ⇒ ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) |
|
Theorem | feq3d 5269 |
Equality deduction for functions. (Contributed by AV, 1-Jan-2020.)
|
⊢ (𝜑 → 𝐴 = 𝐵) ⇒ ⊢ (𝜑 → (𝐹:𝑋⟶𝐴 ↔ 𝐹:𝑋⟶𝐵)) |
|
Theorem | feq12d 5270 |
Equality deduction for functions. (Contributed by Paul Chapman,
22-Jun-2011.)
|
⊢ (𝜑 → 𝐹 = 𝐺)
& ⊢ (𝜑 → 𝐴 = 𝐵) ⇒ ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐶)) |
|
Theorem | feq123d 5271 |
Equality deduction for functions. (Contributed by Paul Chapman,
22-Jun-2011.)
|
⊢ (𝜑 → 𝐹 = 𝐺)
& ⊢ (𝜑 → 𝐴 = 𝐵)
& ⊢ (𝜑 → 𝐶 = 𝐷) ⇒ ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐷)) |
|
Theorem | feq123 5272 |
Equality theorem for functions. (Contributed by FL, 16-Nov-2008.)
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⊢ ((𝐹 = 𝐺 ∧ 𝐴 = 𝐶 ∧ 𝐵 = 𝐷) → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐶⟶𝐷)) |
|
Theorem | feq1i 5273 |
Equality inference for functions. (Contributed by Paul Chapman,
22-Jun-2011.)
|
⊢ 𝐹 = 𝐺 ⇒ ⊢ (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵) |
|
Theorem | feq2i 5274 |
Equality inference for functions. (Contributed by NM, 5-Sep-2011.)
|
⊢ 𝐴 = 𝐵 ⇒ ⊢ (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶) |
|
Theorem | feq23i 5275 |
Equality inference for functions. (Contributed by Paul Chapman,
22-Jun-2011.)
|
⊢ 𝐴 = 𝐶
& ⊢ 𝐵 = 𝐷 ⇒ ⊢ (𝐹:𝐴⟶𝐵 ↔ 𝐹:𝐶⟶𝐷) |
|
Theorem | feq23d 5276 |
Equality deduction for functions. (Contributed by NM, 8-Jun-2013.)
|
⊢ (𝜑 → 𝐴 = 𝐶)
& ⊢ (𝜑 → 𝐵 = 𝐷) ⇒ ⊢ (𝜑 → (𝐹:𝐴⟶𝐵 ↔ 𝐹:𝐶⟶𝐷)) |
|
Theorem | nff 5277 |
Bound-variable hypothesis builder for a mapping. (Contributed by NM,
29-Jan-2004.) (Revised by Mario Carneiro, 15-Oct-2016.)
|
⊢ Ⅎ𝑥𝐹
& ⊢ Ⅎ𝑥𝐴
& ⊢ Ⅎ𝑥𝐵 ⇒ ⊢ Ⅎ𝑥 𝐹:𝐴⟶𝐵 |
|
Theorem | sbcfng 5278* |
Distribute proper substitution through the function predicate with a
domain. (Contributed by Alexander van der Vekens, 15-Jul-2018.)
|
⊢ (𝑋 ∈ 𝑉 → ([𝑋 / 𝑥]𝐹 Fn 𝐴 ↔ ⦋𝑋 / 𝑥⦌𝐹 Fn ⦋𝑋 / 𝑥⦌𝐴)) |
|
Theorem | sbcfg 5279* |
Distribute proper substitution through the function predicate with
domain and codomain. (Contributed by Alexander van der Vekens,
15-Jul-2018.)
|
⊢ (𝑋 ∈ 𝑉 → ([𝑋 / 𝑥]𝐹:𝐴⟶𝐵 ↔ ⦋𝑋 / 𝑥⦌𝐹:⦋𝑋 / 𝑥⦌𝐴⟶⦋𝑋 / 𝑥⦌𝐵)) |
|
Theorem | ffn 5280 |
A mapping is a function. (Contributed by NM, 2-Aug-1994.)
|
⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) |
|
Theorem | ffnd 5281 |
A mapping is a function with domain, deduction form. (Contributed by
Glauco Siliprandi, 17-Aug-2020.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵) ⇒ ⊢ (𝜑 → 𝐹 Fn 𝐴) |
|
Theorem | dffn2 5282 |
Any function is a mapping into V. (Contributed by NM,
31-Oct-1995.)
(Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ (𝐹 Fn 𝐴 ↔ 𝐹:𝐴⟶V) |
|
Theorem | ffun 5283 |
A mapping is a function. (Contributed by NM, 3-Aug-1994.)
|
⊢ (𝐹:𝐴⟶𝐵 → Fun 𝐹) |
|
Theorem | ffund 5284 |
A mapping is a function, deduction version. (Contributed by Glauco
Siliprandi, 3-Mar-2021.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵) ⇒ ⊢ (𝜑 → Fun 𝐹) |
|
Theorem | frel 5285 |
A mapping is a relation. (Contributed by NM, 3-Aug-1994.)
|
⊢ (𝐹:𝐴⟶𝐵 → Rel 𝐹) |
|
Theorem | fdm 5286 |
The domain of a mapping. (Contributed by NM, 2-Aug-1994.)
|
⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) |
|
Theorem | fdmd 5287 |
Deduction form of fdm 5286. The domain of a mapping. (Contributed by
Glauco Siliprandi, 26-Jun-2021.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵) ⇒ ⊢ (𝜑 → dom 𝐹 = 𝐴) |
|
Theorem | fdmi 5288 |
The domain of a mapping. (Contributed by NM, 28-Jul-2008.)
|
⊢ 𝐹:𝐴⟶𝐵 ⇒ ⊢ dom 𝐹 = 𝐴 |
|
Theorem | frn 5289 |
The range of a mapping. (Contributed by NM, 3-Aug-1994.)
|
⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) |
|
Theorem | frnd 5290 |
Deduction form of frn 5289. The range of a mapping. (Contributed by
Glauco Siliprandi, 26-Jun-2021.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵) ⇒ ⊢ (𝜑 → ran 𝐹 ⊆ 𝐵) |
|
Theorem | dffn3 5291 |
A function maps to its range. (Contributed by NM, 1-Sep-1999.)
|
⊢ (𝐹 Fn 𝐴 ↔ 𝐹:𝐴⟶ran 𝐹) |
|
Theorem | fss 5292 |
Expanding the codomain of a mapping. (Contributed by NM, 10-May-1998.)
(Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝐹:𝐴⟶𝐶) |
|
Theorem | fssd 5293 |
Expanding the codomain of a mapping, deduction form. (Contributed by
Glauco Siliprandi, 11-Dec-2019.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
& ⊢ (𝜑 → 𝐵 ⊆ 𝐶) ⇒ ⊢ (𝜑 → 𝐹:𝐴⟶𝐶) |
|
Theorem | fssdmd 5294 |
Expressing that a class is a subclass of the domain of a function
expressed in maps-to notation, deduction form. (Contributed by AV,
21-Aug-2022.)
|
⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
& ⊢ (𝜑 → 𝐷 ⊆ dom 𝐹) ⇒ ⊢ (𝜑 → 𝐷 ⊆ 𝐴) |
|
Theorem | fssdm 5295 |
Expressing that a class is a subclass of the domain of a function
expressed in maps-to notation, semi-deduction form. (Contributed by AV,
21-Aug-2022.)
|
⊢ 𝐷 ⊆ dom 𝐹
& ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) ⇒ ⊢ (𝜑 → 𝐷 ⊆ 𝐴) |
|
Theorem | fco 5296 |
Composition of two mappings. (Contributed by NM, 29-Aug-1999.) (Proof
shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ ((𝐹:𝐵⟶𝐶 ∧ 𝐺:𝐴⟶𝐵) → (𝐹 ∘ 𝐺):𝐴⟶𝐶) |
|
Theorem | fco2 5297 |
Functionality of a composition with weakened out of domain condition on
the first argument. (Contributed by Stefan O'Rear, 11-Mar-2015.)
|
⊢ (((𝐹 ↾ 𝐵):𝐵⟶𝐶 ∧ 𝐺:𝐴⟶𝐵) → (𝐹 ∘ 𝐺):𝐴⟶𝐶) |
|
Theorem | fssxp 5298 |
A mapping is a class of ordered pairs. (Contributed by NM, 3-Aug-1994.)
(Proof shortened by Andrew Salmon, 17-Sep-2011.)
|
⊢ (𝐹:𝐴⟶𝐵 → 𝐹 ⊆ (𝐴 × 𝐵)) |
|
Theorem | fex2 5299 |
A function with bounded domain and range is a set. This version is proven
without the Axiom of Replacement. (Contributed by Mario Carneiro,
24-Jun-2015.)
|
⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝐹 ∈ V) |
|
Theorem | funssxp 5300 |
Two ways of specifying a partial function from 𝐴 to 𝐵.
(Contributed by NM, 13-Nov-2007.)
|
⊢ ((Fun 𝐹 ∧ 𝐹 ⊆ (𝐴 × 𝐵)) ↔ (𝐹:dom 𝐹⟶𝐵 ∧ dom 𝐹 ⊆ 𝐴)) |