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Type | Label | Description |
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Statement | ||
Theorem | fliftval 5801* |
The value of the function ![]() |
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Theorem | isoeq1 5802 | Equality theorem for isomorphisms. (Contributed by NM, 17-May-2004.) |
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Theorem | isoeq2 5803 | Equality theorem for isomorphisms. (Contributed by NM, 17-May-2004.) |
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Theorem | isoeq3 5804 | Equality theorem for isomorphisms. (Contributed by NM, 17-May-2004.) |
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Theorem | isoeq4 5805 | Equality theorem for isomorphisms. (Contributed by NM, 17-May-2004.) |
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Theorem | isoeq5 5806 | Equality theorem for isomorphisms. (Contributed by NM, 17-May-2004.) |
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Theorem | nfiso 5807 | Bound-variable hypothesis builder for an isomorphism. (Contributed by NM, 17-May-2004.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
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Theorem | isof1o 5808 | An isomorphism is a one-to-one onto function. (Contributed by NM, 27-Apr-2004.) |
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Theorem | isorel 5809 | An isomorphism connects binary relations via its function values. (Contributed by NM, 27-Apr-2004.) |
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Theorem | isoresbr 5810* | A consequence of isomorphism on two relations for a function's restriction. (Contributed by Jim Kingdon, 11-Jan-2019.) |
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Theorem | isoid 5811 | Identity law for isomorphism. Proposition 6.30(1) of [TakeutiZaring] p. 33. (Contributed by NM, 27-Apr-2004.) |
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Theorem | isocnv 5812 | Converse law for isomorphism. Proposition 6.30(2) of [TakeutiZaring] p. 33. (Contributed by NM, 27-Apr-2004.) |
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Theorem | isocnv2 5813 | Converse law for isomorphism. (Contributed by Mario Carneiro, 30-Jan-2014.) |
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Theorem | isores2 5814 | An isomorphism from one well-order to another can be restricted on either well-order. (Contributed by Mario Carneiro, 15-Jan-2013.) |
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Theorem | isores1 5815 | An isomorphism from one well-order to another can be restricted on either well-order. (Contributed by Mario Carneiro, 15-Jan-2013.) |
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Theorem | isores3 5816 | Induced isomorphism on a subset. (Contributed by Stefan O'Rear, 5-Nov-2014.) |
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Theorem | isotr 5817 | Composition (transitive) law for isomorphism. Proposition 6.30(3) of [TakeutiZaring] p. 33. (Contributed by NM, 27-Apr-2004.) (Proof shortened by Mario Carneiro, 5-Dec-2016.) |
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Theorem | iso0 5818 |
The empty set is an ![]() ![]() ![]() |
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Theorem | isoini 5819 | Isomorphisms preserve initial segments. Proposition 6.31(2) of [TakeutiZaring] p. 33. (Contributed by NM, 20-Apr-2004.) |
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Theorem | isoini2 5820 | Isomorphisms are isomorphisms on their initial segments. (Contributed by Mario Carneiro, 29-Mar-2014.) |
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Theorem | isoselem 5821* | Lemma for isose 5822. (Contributed by Mario Carneiro, 23-Jun-2015.) |
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Theorem | isose 5822 | An isomorphism preserves set-like relations. (Contributed by Mario Carneiro, 23-Jun-2015.) |
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Theorem | isopolem 5823 | Lemma for isopo 5824. (Contributed by Stefan O'Rear, 16-Nov-2014.) |
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Theorem | isopo 5824 | An isomorphism preserves partial ordering. (Contributed by Stefan O'Rear, 16-Nov-2014.) |
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Theorem | isosolem 5825 | Lemma for isoso 5826. (Contributed by Stefan O'Rear, 16-Nov-2014.) |
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Theorem | isoso 5826 | An isomorphism preserves strict ordering. (Contributed by Stefan O'Rear, 16-Nov-2014.) |
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Theorem | f1oiso 5827* |
Any one-to-one onto function determines an isomorphism with an induced
relation ![]() |
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Theorem | f1oiso2 5828* |
Any one-to-one onto function determines an isomorphism with an induced
relation ![]() |
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Theorem | canth 5829 |
No set ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Syntax | crio 5830 | Extend class notation with restricted description binder. |
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Definition | df-riota 5831 |
Define restricted description binder. In case there is no unique ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | riotaeqdv 5832* | Formula-building deduction for iota. (Contributed by NM, 15-Sep-2011.) |
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Theorem | riotabidv 5833* | Formula-building deduction for restricted iota. (Contributed by NM, 15-Sep-2011.) |
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Theorem | riotaeqbidv 5834* | Equality deduction for restricted universal quantifier. (Contributed by NM, 15-Sep-2011.) |
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Theorem | riotaexg 5835* | Restricted iota is a set. (Contributed by Jim Kingdon, 15-Jun-2020.) |
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Theorem | riotav 5836 | An iota restricted to the universe is unrestricted. (Contributed by NM, 18-Sep-2011.) |
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Theorem | riotauni 5837 | Restricted iota in terms of class union. (Contributed by NM, 11-Oct-2011.) |
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Theorem | nfriota1 5838* | The abstraction variable in a restricted iota descriptor isn't free. (Contributed by NM, 12-Oct-2011.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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Theorem | nfriotadxy 5839* | Deduction version of nfriota 5840. (Contributed by Jim Kingdon, 12-Jan-2019.) |
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Theorem | nfriota 5840* | A variable not free in a wff remains so in a restricted iota descriptor. (Contributed by NM, 12-Oct-2011.) |
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Theorem | cbvriota 5841* | Change bound variable in a restricted description binder. (Contributed by NM, 18-Mar-2013.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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Theorem | cbvriotav 5842* | Change bound variable in a restricted description binder. (Contributed by NM, 18-Mar-2013.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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Theorem | csbriotag 5843* | Interchange class substitution and restricted description binder. (Contributed by NM, 24-Feb-2013.) |
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Theorem | riotacl2 5844 |
Membership law for "the unique element in ![]() ![]() (Contributed by NM, 21-Aug-2011.) (Revised by Mario Carneiro, 23-Dec-2016.) |
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Theorem | riotacl 5845* | Closure of restricted iota. (Contributed by NM, 21-Aug-2011.) |
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Theorem | riotasbc 5846 | Substitution law for descriptions. (Contributed by NM, 23-Aug-2011.) (Proof shortened by Mario Carneiro, 24-Dec-2016.) |
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Theorem | riotabidva 5847* | Equivalent wff's yield equal restricted class abstractions (deduction form). (rabbidva 2726 analog.) (Contributed by NM, 17-Jan-2012.) |
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Theorem | riotabiia 5848 | Equivalent wff's yield equal restricted iotas (inference form). (rabbiia 2723 analog.) (Contributed by NM, 16-Jan-2012.) |
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Theorem | riota1 5849* | Property of restricted iota. Compare iota1 5193. (Contributed by Mario Carneiro, 15-Oct-2016.) |
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Theorem | riota1a 5850 | Property of iota. (Contributed by NM, 23-Aug-2011.) |
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Theorem | riota2df 5851* | A deduction version of riota2f 5852. (Contributed by NM, 17-Feb-2013.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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Theorem | riota2f 5852* |
This theorem shows a condition that allows us to represent a descriptor
with a class expression ![]() |
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Theorem | riota2 5853* |
This theorem shows a condition that allows us to represent a descriptor
with a class expression ![]() |
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Theorem | riotaprop 5854* | Properties of a restricted definite description operator. Todo (df-riota 5831 update): can some uses of riota2f 5852 be shortened with this? (Contributed by NM, 23-Nov-2013.) |
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Theorem | riota5f 5855* | A method for computing restricted iota. (Contributed by NM, 16-Apr-2013.) (Revised by Mario Carneiro, 15-Oct-2016.) |
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Theorem | riota5 5856* | A method for computing restricted iota. (Contributed by NM, 20-Oct-2011.) (Revised by Mario Carneiro, 6-Dec-2016.) |
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Theorem | riotass2 5857* | Restriction of a unique element to a smaller class. (Contributed by NM, 21-Aug-2011.) (Revised by NM, 22-Mar-2013.) |
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Theorem | riotass 5858* | Restriction of a unique element to a smaller class. (Contributed by NM, 19-Oct-2005.) (Revised by Mario Carneiro, 24-Dec-2016.) |
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Theorem | moriotass 5859* | Restriction of a unique element to a smaller class. (Contributed by NM, 19-Feb-2006.) (Revised by NM, 16-Jun-2017.) |
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Theorem | snriota 5860 | A restricted class abstraction with a unique member can be expressed as a singleton. (Contributed by NM, 30-May-2006.) |
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Theorem | eusvobj2 5861* |
Specify the same property in two ways when class ![]() ![]() ![]() ![]() |
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Theorem | eusvobj1 5862* |
Specify the same object in two ways when class ![]() ![]() ![]() ![]() |
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Theorem | f1ofveu 5863* | There is one domain element for each value of a one-to-one onto function. (Contributed by NM, 26-May-2006.) |
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Theorem | f1ocnvfv3 5864* | Value of the converse of a one-to-one onto function. (Contributed by NM, 26-May-2006.) (Proof shortened by Mario Carneiro, 24-Dec-2016.) |
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Theorem | riotaund 5865* | Restricted iota equals the empty set when not meaningful. (Contributed by NM, 16-Jan-2012.) (Revised by Mario Carneiro, 15-Oct-2016.) (Revised by NM, 13-Sep-2018.) |
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Theorem | acexmidlema 5866* | Lemma for acexmid 5874. (Contributed by Jim Kingdon, 6-Aug-2019.) |
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Theorem | acexmidlemb 5867* | Lemma for acexmid 5874. (Contributed by Jim Kingdon, 6-Aug-2019.) |
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Theorem | acexmidlemph 5868* | Lemma for acexmid 5874. (Contributed by Jim Kingdon, 6-Aug-2019.) |
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Theorem | acexmidlemab 5869* | Lemma for acexmid 5874. (Contributed by Jim Kingdon, 6-Aug-2019.) |
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Theorem | acexmidlemcase 5870* |
Lemma for acexmid 5874. Here we divide the proof into cases (based
on the
disjunction implicit in an unordered pair, not the sort of case
elimination which relies on excluded middle).
The cases are (1) the choice function evaluated at
Because of the way we represent the choice function
Although it isn't exactly about the division into cases, it is also
convenient for this lemma to also include the step that if the choice
function evaluated at (Contributed by Jim Kingdon, 7-Aug-2019.) |
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Theorem | acexmidlem1 5871* | Lemma for acexmid 5874. List the cases identified in acexmidlemcase 5870 and hook them up to the lemmas which handle each case. (Contributed by Jim Kingdon, 7-Aug-2019.) |
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Theorem | acexmidlem2 5872* |
Lemma for acexmid 5874. This builds on acexmidlem1 5871 by noting that every
element of ![]()
(Note that
The set (Contributed by Jim Kingdon, 5-Aug-2019.) |
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Theorem | acexmidlemv 5873* |
Lemma for acexmid 5874.
This is acexmid 5874 with additional disjoint variable conditions,
most
notably between (Contributed by Jim Kingdon, 6-Aug-2019.) |
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Theorem | acexmid 5874* |
The axiom of choice implies excluded middle. Theorem 1.3 in [Bauer]
p. 483.
The statement of the axiom of choice given here is ac2 in the Metamath
Proof Explorer (version of 3-Aug-2019). In particular, note that the
choice function Essentially the same proof can also be found at "The axiom of choice implies instances of EM", [Crosilla], p. "Set-theoretic principles incompatible with intuitionistic logic". Often referred to as Diaconescu's theorem, or Diaconescu-Goodman-Myhill theorem, after Radu Diaconescu who discovered it in 1975 in the framework of topos theory and N. D. Goodman and John Myhill in 1978 in the framework of set theory (although it already appeared as an exercise in Errett Bishop's book Foundations of Constructive Analysis from 1967). For this theorem stated using the df-ac 7205 and df-exmid 4196 syntaxes, see exmidac 7208. (Contributed by Jim Kingdon, 4-Aug-2019.) |
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Syntax | co 5875 |
Extend class notation to include the value of an operation ![]() ![]() ![]() |
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Syntax | coprab 5876 | Extend class notation to include class abstraction (class builder) of nested ordered pairs. |
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Syntax | cmpo 5877 | Extend the definition of a class to include maps-to notation for defining an operation via a rule. |
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Definition | df-ov 5878 |
Define the value of an operation. Definition of operation value in
[Enderton] p. 79. Note that the syntax
is simply three class expressions
in a row bracketed by parentheses. There are no restrictions of any kind
on what those class expressions may be, although only certain kinds of
class expressions - a binary operation ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Definition | df-oprab 5879* |
Define the class abstraction (class builder) of a collection of nested
ordered pairs (for use in defining operations). This is a special case
of Definition 4.16 of [TakeutiZaring] p. 14. Normally ![]() ![]() ![]() |
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Definition | df-mpo 5880* |
Define maps-to notation for defining an operation via a rule. Read as
"the operation defined by the map from ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | oveq 5881 | Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) |
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Theorem | oveq1 5882 | Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) |
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Theorem | oveq2 5883 | Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) |
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Theorem | oveq12 5884 | Equality theorem for operation value. (Contributed by NM, 16-Jul-1995.) |
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Theorem | oveq1i 5885 | Equality inference for operation value. (Contributed by NM, 28-Feb-1995.) |
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Theorem | oveq2i 5886 | Equality inference for operation value. (Contributed by NM, 28-Feb-1995.) |
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Theorem | oveq12i 5887 | Equality inference for operation value. (Contributed by NM, 28-Feb-1995.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
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Theorem | oveqi 5888 | Equality inference for operation value. (Contributed by NM, 24-Nov-2007.) |
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Theorem | oveq123i 5889 | Equality inference for operation value. (Contributed by FL, 11-Jul-2010.) |
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Theorem | oveq1d 5890 | Equality deduction for operation value. (Contributed by NM, 13-Mar-1995.) |
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Theorem | oveq2d 5891 | Equality deduction for operation value. (Contributed by NM, 13-Mar-1995.) |
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Theorem | oveqd 5892 | Equality deduction for operation value. (Contributed by NM, 9-Sep-2006.) |
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Theorem | oveq12d 5893 | Equality deduction for operation value. (Contributed by NM, 13-Mar-1995.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
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Theorem | oveqan12d 5894 | Equality deduction for operation value. (Contributed by NM, 10-Aug-1995.) |
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Theorem | oveqan12rd 5895 | Equality deduction for operation value. (Contributed by NM, 10-Aug-1995.) |
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Theorem | oveq123d 5896 | Equality deduction for operation value. (Contributed by FL, 22-Dec-2008.) |
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Theorem | fvoveq1d 5897 | Equality deduction for nested function and operation value. (Contributed by AV, 23-Jul-2022.) |
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Theorem | fvoveq1 5898 | Equality theorem for nested function and operation value. Closed form of fvoveq1d 5897. (Contributed by AV, 23-Jul-2022.) |
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Theorem | ovanraleqv 5899* | Equality theorem for a conjunction with an operation values within a restricted universal quantification. Technical theorem to be used to reduce the size of a significant number of proofs. (Contributed by AV, 13-Aug-2022.) |
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Theorem | imbrov2fvoveq 5900 | Equality theorem for nested function and operation value in an implication for a binary relation. Technical theorem to be used to reduce the size of a significant number of proofs. (Contributed by AV, 17-Aug-2022.) |
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