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Statement | ||
Theorem | findcard 6901* | Schema for induction on the cardinality of a finite set. The inductive hypothesis is that the result is true on the given set with any one element removed. The result is then proven to be true for all finite sets. (Contributed by Jeff Madsen, 2-Sep-2009.) |
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Theorem | findcard2 6902* | Schema for induction on the cardinality of a finite set. The inductive step shows that the result is true if one more element is added to the set. The result is then proven to be true for all finite sets. (Contributed by Jeff Madsen, 8-Jul-2010.) |
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Theorem | findcard2s 6903* | Variation of findcard2 6902 requiring that the element added in the induction step not be a member of the original set. (Contributed by Paul Chapman, 30-Nov-2012.) |
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Theorem | findcard2d 6904* |
Deduction version of findcard2 6902. If you also need ![]() ![]() ![]() |
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Theorem | findcard2sd 6905* | Deduction form of finite set induction . (Contributed by Jim Kingdon, 14-Sep-2021.) |
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Theorem | diffisn 6906 | Subtracting a singleton from a finite set produces a finite set. (Contributed by Jim Kingdon, 11-Sep-2021.) |
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Theorem | diffifi 6907 | Subtracting one finite set from another produces a finite set. (Contributed by Jim Kingdon, 8-Sep-2021.) |
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Theorem | infnfi 6908 | An infinite set is not finite. (Contributed by Jim Kingdon, 20-Feb-2022.) |
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Theorem | ominf 6909 |
The set of natural numbers is not finite. Although we supply this theorem
because we can, the more natural way to express "![]() ![]() ![]() ![]() |
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Theorem | isinfinf 6910* | An infinite set contains subsets of arbitrarily large finite cardinality. (Contributed by Jim Kingdon, 15-Jun-2022.) |
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Theorem | ac6sfi 6911* | Existence of a choice function for finite sets. (Contributed by Jeff Hankins, 26-Jun-2009.) (Proof shortened by Mario Carneiro, 29-Jan-2014.) |
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Theorem | tridc 6912* | A trichotomous order is decidable. (Contributed by Jim Kingdon, 5-Sep-2022.) |
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Theorem | fimax2gtrilemstep 6913* | Lemma for fimax2gtri 6914. The induction step. (Contributed by Jim Kingdon, 5-Sep-2022.) |
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Theorem | fimax2gtri 6914* | A finite set has a maximum under a trichotomous order. (Contributed by Jim Kingdon, 5-Sep-2022.) |
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Theorem | finexdc 6915* | Decidability of existence, over a finite set and defined by a decidable proposition. (Contributed by Jim Kingdon, 12-Jul-2022.) |
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Theorem | dfrex2fin 6916* | Relationship between universal and existential quantifiers over a finite set. Remark in Section 2.2.1 of [Pierik], p. 8. Although Pierik does not mention the decidability condition explicitly, it does say "only finitely many x to check" which means there must be some way of checking each value of x. (Contributed by Jim Kingdon, 11-Jul-2022.) |
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Theorem | infm 6917* | An infinite set is inhabited. (Contributed by Jim Kingdon, 18-Feb-2022.) |
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Theorem | infn0 6918 | An infinite set is not empty. (Contributed by NM, 23-Oct-2004.) |
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Theorem | inffiexmid 6919* | If any given set is either finite or infinite, excluded middle follows. (Contributed by Jim Kingdon, 15-Jun-2022.) |
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Theorem | en2eqpr 6920 | Building a set with two elements. (Contributed by FL, 11-Aug-2008.) (Revised by Mario Carneiro, 10-Sep-2015.) |
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Theorem | exmidpw 6921 |
Excluded middle is equivalent to the power set of ![]() |
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Theorem | exmidpweq 6922 |
Excluded middle is equivalent to the power set of ![]() ![]() |
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Theorem | pw1fin 6923 |
Excluded middle is equivalent to the power set of ![]() |
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Theorem | pw1dc0el 6924 | Another equivalent of excluded middle, which is a mere reformulation of the definition. (Contributed by BJ, 9-Aug-2024.) |
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Theorem | ss1o0el1o 6925 |
Reformulation of ss1o0el1 4209 using ![]() ![]() ![]() ![]() |
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Theorem | pw1dc1 6926 | If, in the set of truth values (the powerset of 1o), equality to 1o is decidable, then excluded middle holds (and conversely). (Contributed by BJ and Jim Kingdon, 8-Aug-2024.) |
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Theorem | fientri3 6927 | Trichotomy of dominance for finite sets. (Contributed by Jim Kingdon, 15-Sep-2021.) |
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Theorem | nnwetri 6928* |
A natural number is well-ordered by ![]() ![]() |
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Theorem | onunsnss 6929 | Adding a singleton to create an ordinal. (Contributed by Jim Kingdon, 20-Oct-2021.) |
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Theorem | unfiexmid 6930* | If the union of any two finite sets is finite, excluded middle follows. Remark 8.1.17 of [AczelRathjen], p. 74. (Contributed by Mario Carneiro and Jim Kingdon, 5-Mar-2022.) |
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Theorem | unsnfi 6931 | Adding a singleton to a finite set yields a finite set. (Contributed by Jim Kingdon, 3-Feb-2022.) |
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Theorem | unsnfidcex 6932 |
The ![]() ![]() ![]() |
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Theorem | unsnfidcel 6933 |
The ![]() ![]() ![]() ![]() |
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Theorem | unfidisj 6934 | The union of two disjoint finite sets is finite. (Contributed by Jim Kingdon, 25-Feb-2022.) |
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Theorem | undifdcss 6935* | Union of complementary parts into whole and decidability. (Contributed by Jim Kingdon, 17-Jun-2022.) |
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Theorem | undifdc 6936* | Union of complementary parts into whole. This is a case where we can strengthen undifss 3515 from subset to equality. (Contributed by Jim Kingdon, 17-Jun-2022.) |
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Theorem | undiffi 6937 | Union of complementary parts into whole. This is a case where we can strengthen undifss 3515 from subset to equality. (Contributed by Jim Kingdon, 2-Mar-2022.) |
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Theorem | unfiin 6938 | The union of two finite sets is finite if their intersection is. (Contributed by Jim Kingdon, 2-Mar-2022.) |
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Theorem | prfidisj 6939 |
A pair is finite if it consists of two unequal sets. For the case where
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Theorem | tpfidisj 6940 | A triple is finite if it consists of three unequal sets. (Contributed by Jim Kingdon, 1-Oct-2022.) |
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Theorem | fiintim 6941* |
If a class is closed under pairwise intersections, then it is closed
under nonempty finite intersections. The converse would appear to
require an additional condition, such as ![]() ![]() ![]() This theorem is applicable to a topology, which (among other axioms) is closed under finite intersections. Some texts use a pairwise intersection and some texts use a finite intersection, but most topology texts assume excluded middle (in which case the two intersection properties would be equivalent). (Contributed by NM, 22-Sep-2002.) (Revised by Jim Kingdon, 14-Jan-2023.) |
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Theorem | xpfi 6942 | The Cartesian product of two finite sets is finite. Lemma 8.1.16 of [AczelRathjen], p. 74. (Contributed by Jeff Madsen, 2-Sep-2009.) (Revised by Mario Carneiro, 12-Mar-2015.) |
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Theorem | 3xpfi 6943 | The Cartesian product of three finite sets is a finite set. (Contributed by Alexander van der Vekens, 11-Mar-2018.) |
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Theorem | fisseneq 6944 | A finite set is equal to its subset if they are equinumerous. (Contributed by FL, 11-Aug-2008.) |
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Theorem | phpeqd 6945 | Corollary of the Pigeonhole Principle using equality. Strengthening of phpm 6878 expressed without negation. (Contributed by Rohan Ridenour, 3-Aug-2023.) |
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Theorem | ssfirab 6946* | A subset of a finite set is finite if it is defined by a decidable property. (Contributed by Jim Kingdon, 27-May-2022.) |
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Theorem | ssfidc 6947* | A subset of a finite set is finite if membership in the subset is decidable. (Contributed by Jim Kingdon, 27-May-2022.) |
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Theorem | snon0 6948 |
An ordinal which is a singleton is ![]() ![]() ![]() |
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Theorem | fnfi 6949 | A version of fnex 5751 for finite sets. (Contributed by Mario Carneiro, 16-Nov-2014.) (Revised by Mario Carneiro, 24-Jun-2015.) |
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Theorem | fundmfi 6950 | The domain of a finite function is finite. (Contributed by Jim Kingdon, 5-Feb-2022.) |
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Theorem | fundmfibi 6951 | A function is finite if and only if its domain is finite. (Contributed by AV, 10-Jan-2020.) |
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Theorem | resfnfinfinss 6952 | The restriction of a function to a finite subset of its domain is finite. (Contributed by Alexander van der Vekens, 3-Feb-2018.) |
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Theorem | relcnvfi 6953 | If a relation is finite, its converse is as well. (Contributed by Jim Kingdon, 5-Feb-2022.) |
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Theorem | funrnfi 6954 | The range of a finite relation is finite if its converse is a function. (Contributed by Jim Kingdon, 5-Feb-2022.) |
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Theorem | f1ofi 6955 | If a 1-1 and onto function has a finite domain, its range is finite. (Contributed by Jim Kingdon, 21-Feb-2022.) |
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Theorem | f1dmvrnfibi 6956 | A one-to-one function whose domain is a set is finite if and only if its range is finite. See also f1vrnfibi 6957. (Contributed by AV, 10-Jan-2020.) |
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Theorem | f1vrnfibi 6957 | A one-to-one function which is a set is finite if and only if its range is finite. See also f1dmvrnfibi 6956. (Contributed by AV, 10-Jan-2020.) |
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Theorem | iunfidisj 6958* |
The finite union of disjoint finite sets is finite. Note that ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | f1finf1o 6959 | Any injection from one finite set to another of equal size must be a bijection. (Contributed by Jeff Madsen, 5-Jun-2010.) |
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Theorem | en1eqsn 6960 | A set with one element is a singleton. (Contributed by FL, 18-Aug-2008.) |
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Theorem | en1eqsnbi 6961 | A set containing an element has exactly one element iff it is a singleton. (Contributed by FL, 13-Feb-2010.) (Revised by AV, 25-Jan-2020.) |
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Theorem | snexxph 6962* |
A case where the antecedent of snexg 4196 is not needed. The class
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Theorem | preimaf1ofi 6963 | The preimage of a finite set under a one-to-one, onto function is finite. (Contributed by Jim Kingdon, 24-Sep-2022.) |
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Theorem | fidcenumlemim 6964* | Lemma for fidcenum 6968. Forward direction. (Contributed by Jim Kingdon, 19-Oct-2022.) |
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Theorem | fidcenumlemrks 6965* | Lemma for fidcenum 6968. Induction step for fidcenumlemrk 6966. (Contributed by Jim Kingdon, 20-Oct-2022.) |
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Theorem | fidcenumlemrk 6966* | Lemma for fidcenum 6968. (Contributed by Jim Kingdon, 20-Oct-2022.) |
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Theorem | fidcenumlemr 6967* | Lemma for fidcenum 6968. Reverse direction (put into deduction form). (Contributed by Jim Kingdon, 19-Oct-2022.) |
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Theorem | fidcenum 6968* |
A set is finite if and only if it has decidable equality and is finitely
enumerable. Proposition 8.1.11 of [AczelRathjen], p. 72. The
definition of "finitely enumerable" as
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Theorem | sbthlem1 6969* | Lemma for isbth 6979. (Contributed by NM, 22-Mar-1998.) |
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Theorem | sbthlem2 6970* | Lemma for isbth 6979. (Contributed by NM, 22-Mar-1998.) |
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Theorem | sbthlemi3 6971* | Lemma for isbth 6979. (Contributed by NM, 22-Mar-1998.) |
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Theorem | sbthlemi4 6972* | Lemma for isbth 6979. (Contributed by NM, 27-Mar-1998.) |
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Theorem | sbthlemi5 6973* | Lemma for isbth 6979. (Contributed by NM, 22-Mar-1998.) |
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Theorem | sbthlemi6 6974* | Lemma for isbth 6979. (Contributed by NM, 27-Mar-1998.) |
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Theorem | sbthlem7 6975* | Lemma for isbth 6979. (Contributed by NM, 27-Mar-1998.) |
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Theorem | sbthlemi8 6976* | Lemma for isbth 6979. (Contributed by NM, 27-Mar-1998.) |
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Theorem | sbthlemi9 6977* | Lemma for isbth 6979. (Contributed by NM, 28-Mar-1998.) |
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Theorem | sbthlemi10 6978* | Lemma for isbth 6979. (Contributed by NM, 28-Mar-1998.) |
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Theorem | isbth 6979 |
Schroeder-Bernstein Theorem. Theorem 18 of [Suppes] p. 95. This
theorem states that if set ![]() ![]() ![]() ![]() |
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Syntax | cfi 6980 | Extend class notation with the function whose value is the class of finite intersections of the elements of a given set. |
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Definition | df-fi 6981* | Function whose value is the class of finite intersections of the elements of the argument. Note that the empty intersection being the universal class, hence a proper class, it cannot be an element of that class. Therefore, the function value is the class of nonempty finite intersections of elements of the argument (see elfi2 6984). (Contributed by FL, 27-Apr-2008.) |
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Theorem | fival 6982* |
The set of all the finite intersections of the elements of ![]() |
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Theorem | elfi 6983* |
Specific properties of an element of ![]() ![]() ![]() ![]() ![]() |
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Theorem | elfi2 6984* | The empty intersection need not be considered in the set of finite intersections. (Contributed by Mario Carneiro, 21-Mar-2015.) |
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Theorem | elfir 6985 |
Sufficient condition for an element of ![]() ![]() ![]() ![]() ![]() |
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Theorem | ssfii 6986 |
Any element of a set ![]() ![]() |
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Theorem | fi0 6987 | The set of finite intersections of the empty set. (Contributed by Mario Carneiro, 30-Aug-2015.) |
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Theorem | fieq0 6988 | A set is empty iff the class of all the finite intersections of that set is empty. (Contributed by FL, 27-Apr-2008.) (Revised by Mario Carneiro, 24-Nov-2013.) |
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Theorem | fiss 6989 |
Subset relationship for function ![]() |
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Theorem | fiuni 6990 | The union of the finite intersections of a set is simply the union of the set itself. (Contributed by Jeff Hankins, 5-Sep-2009.) (Revised by Mario Carneiro, 24-Nov-2013.) |
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Theorem | fipwssg 6991 | If a set is a family of subsets of some base set, then so is its finite intersection. (Contributed by Stefan O'Rear, 2-Aug-2015.) |
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Theorem | fifo 6992* | Describe a surjection from nonempty finite sets to finite intersections. (Contributed by Mario Carneiro, 18-May-2015.) |
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Theorem | dcfi 6993* | Decidability of a family of propositions indexed by a finite set. (Contributed by Jim Kingdon, 30-Sep-2024.) |
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Syntax | csup 6994 |
Extend class notation to include supremum of class ![]() ![]() ![]() ![]() ![]() |
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Syntax | cinf 6995 |
Extend class notation to include infimum of class ![]() ![]() ![]() ![]() ![]() |
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Definition | df-sup 6996* |
Define the supremum of class ![]() ![]() ![]() |
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Definition | df-inf 6997 |
Define the infimum of class ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | supeq1 6998 | Equality theorem for supremum. (Contributed by NM, 22-May-1999.) |
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Theorem | supeq1d 6999 | Equality deduction for supremum. (Contributed by Paul Chapman, 22-Jun-2011.) |
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Theorem | supeq1i 7000 | Equality inference for supremum. (Contributed by Paul Chapman, 22-Jun-2011.) |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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