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In the branch of [[mathematical logic]] called [[model theory]], an '''elementary class''' (or '''axiomatizable class''') is a [[class (set theory)|class]] consisting of all [[structure (mathematical logic)|structures]] satisfying a fixed [[first-order logic|first-order]] [[theory (mathematical logic)|theory]].


== Definition ==
A [[class (set theory)|class]] ''K'' of [[structure (mathematical logic)|structures]] of a [[signature (logic)|signature]] σ is called an '''elementary class''' if there is a [[first-order logic|first-order]] [[theory (mathematical logic)|theory]] ''T'' of signature σ, such that ''K'' consists of all models of ''T'', i.e., of all σ-structures that satisfy ''T''. If ''T'' can be chosen as a theory consisting of a single first-order sentence, then ''K'' is called a '''basic elementary class'''.


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More generally, ''K'' is a [[pseudoelementary class|pseudo-elementary class]] if there is a first-order theory ''T'' of a signature that extends σ, such that ''K'' consists of all σ-structures that are [[reduct]]s to σ of models of ''T''. In other words, a class ''K'' of σ-structures is pseudo-elementary [[iff]] there is an elementary class ''K<nowiki>'</nowiki>'' such that ''K'' consists of precisely the reducts to σ of the structures in ''K<nowiki>'</nowiki>''.
 
For obvious reasons, elementary classes are also called '''axiomatizable in first-order logic''', and basic elementary classes are called '''finitely axiomatizable in first-order logic'''. These definitions extend to other logics in the obvious way, but since the first-order case is by far the most important, '''axiomatizable''' implicitly refers to this case when no other logic is specified.
 
== Conflicting and alternative terminology ==
While the above is nowadays standard terminology in [[model theory|"infinite" model theory]], the slightly different earlier definitions are still in use in [[finite model theory]], where an elementary class may be called a '''Δ-elementary class''', and the terms '''elementary class''' and '''first-order axiomatizable class''' are reserved for basic elementary classes (Ebbinghaus et al. 1994, Ebbinghaus and Flum 2005). Hodges calls elementary classes '''axiomatizable classes''', and he refers to basic elementary classes as '''definable classes'''. He also uses the respective synonyms '''EC class''' and '''EC<math>_\Delta</math> class''' (Hodges, 1993).
 
There are good reasons for this diverging terminology. The [[signature (logic)|signature]]s that are considered in general model theory are often infinite, while a single [[first-order logic|first-order]] [[sentence (mathematical logic)|sentence]] contains only finitely many symbols. Therefore basic elementary classes are atypical in infinite model theory. Finite model theory, on the other hand, deals almost exclusively with finite signatures. It is easy to see that for every finite signature σ and for every class ''K'' of σ-structures closed under isomorphism there is an elementary class <math>K'</math> of σ-structures such that ''K'' and <math>K'</math> contain precisely the same finite structures. Hence elementary classes are not very interesting for finite model theorists.
 
== Easy relations between the notions ==
 
Clearly every basic elementary class is an elementary class, and every elementary class is a pseudo-elementary class. Moreover, as an easy consequence of the [[compactness theorem]], a class of σ-structures is basic elementary if and only if it is elementary and its complement is also elementary.
 
== Examples ==
=== A basic elementary class ===
Let σ be a signature consisting only of a [[unary function]] symbol ''f''.  The class ''K'' of σ-structures in which ''f'' is [[injection (mathematics)|one-to-one]] is a basic elementary class. This is witnessed by the theory ''T'', which consists only of the single sentence
:<math>\forall x\forall y( (f(x)=f(y)) \to (x=y) )</math>.
 
=== An elementary, basic pseudoelementary class that is not basic elementary ===
Let σ be an arbitrary signature. The class ''K'' of all infinite σ-structures is elementary. To see this, consider the sentences
 
:<math>\rho_2={}</math> "<math>\exist x_1\exist x_2(x_1 \not =x_2)</math>",
 
:<math>\rho_3={}</math> "<math>\exist x_1\exist x_2\exist x_3((x_1 \not =x_2) \and (x_1 \not =x_3) \and (x_2 \not =x_3))</math>",
 
and so on. (So the sentence <math>\rho_n</math> says that there are at least ''n'' elements.) The infinite σ-structures are precisely the models of the theory
 
:<math>T_\infty=\{\rho_2, \rho_3, \rho_4, \dots\}</math>.
 
But ''K'' is not a basic elementary class. Otherwise the infinite σ-structures would be precisely those that satisfy a certain first-order sentence τ. But then the set
<math>\{\neg\tau, \rho_2, \rho_3, \rho_4, \dots\}</math> would be inconsistent. By the [[compactness theorem]], for some natural number ''n'' the set <math>\{\neg\tau, \rho_2, \rho_3, \rho_4, \dots, \rho_n\}</math> would be inconsistent. But this is absurd, because this theory is satisfied by any σ-structure with <math>n+1</math> or more elements.
 
However, there is a basic elementary class ''K<nowiki>'</nowiki>'' in the signature σ' = σ <math>\cup</math> {''f''}, where ''f'' is a unary function symbol, such that ''K'' consists exactly of the reducts to σ of σ'-structures in ''K<nowiki>'</nowiki>''. ''K<nowiki>'</nowiki>'' is axiomatised by the single sentence <math>(\forall x\forall y(f(x) = f(y) \rightarrow x=y) \land \exists y\neg\exists x(y = f(x))),</math>, which expresses that ''f'' is injective but not surjective. Therefore ''K'' is elementary and what could be called basic pseudo-elementary, but not basic elementary.
 
=== Pseudo-elementary class that is non-elementary ===
Finally, consider the signature σ consisting of a single unary relation symbol ''P''. Every σ-structure is [[partition of a set|partitioned]] into two subsets: Those elements for which ''P'' holds, and the rest. Let ''K'' be the class of all σ-structures for which these two subsets have the same [[cardinality]], i.e., there is a bijection between them. This class is not elementary, because a σ-structure in which both the set of realisations of ''P'' and its complement are countably infinite satisfies precisely the same first-order sentences as a σ-structure in which one of the sets is countably infinite and the other is uncountable.
 
Now consider the signature <math>\sigma'</math>, which consists of ''P'' along with a unary function symbol ''f''. Let <math>K'</math> be the class of all <math>\sigma'</math>-structures such that ''f'' is a bijection and ''P'' holds for ''x'' [[iff]] ''P'' does not hold for ''f(x)''. <math>K'</math> is clearly an elementary class, and therefore ''K'' is an example of a pseudo-elementary class that is not elementary.
 
=== Non-pseudo-elementary class===
Let σ be an arbitrary signature. The class ''K'' of all finite σ-structures is not elementary, because (as shown above) its complement is elementary but not basic elementary. Since this is also true for every signature extending σ, ''K'' is not even a pseudo-elementary class.
 
This example demonstrates the limits of expressive power inherent in [[first-order logic]] as opposed to the far more expressive [[second-order logic]]. Second-order logic, however, fails to retain many desirable properties of first-order logic, such as the compactness theorem.
 
== References ==
 
* {{Citation | last1=Chang | first1=Chen Chung | last2=Keisler | first2=H. Jerome | author2-link=Howard Jerome Keisler | title=Model Theory | origyear=1973 | publisher=[[Elsevier]] | edition=3rd | series=Studies in Logic and the Foundations of Mathematics | isbn=978-0-444-88054-3 | year=1990}}
* {{Citation | last1=Ebbinghaus | first1=Heinz-Dieter | last2=Flum | first2=Jörg | title=Finite model theory | origyear=1995 | publisher=[[Springer-Verlag]] | location=Berlin, New York | isbn=978-3-540-28787-2 | year=2005 | pages=360}}
* {{Citation | last1=Ebbinghaus | first1=Heinz-Dieter | last2=Flum | first2=Jörg | last3=Thomas | first3=Wolfgang | title=Mathematical Logic | publisher=[[Springer-Verlag]] | location=Berlin, New York | edition=2nd | isbn=978-0-387-94258-2 | year=1994}}
* {{Citation | last1=Hodges | first1=Wilfrid | author1-link=Wilfrid Hodges | title=A shorter model theory | publisher=[[Cambridge University Press]] | isbn=978-0-521-58713-6 | year=1997}}
* {{Citation | last1=Poizat | first1=Bruno | title=A Course in Model Theory: An Introduction to Contemporary Mathematical Logic | publisher=[[Springer-Verlag]] | location=Berlin, New York | isbn=978-0-387-98655-5 | year=2000}}
 
{{DEFAULTSORT:Elementary Class}}
[[Category:Model theory]]

Revision as of 17:39, 6 December 2013

In the branch of mathematical logic called model theory, an elementary class (or axiomatizable class) is a class consisting of all structures satisfying a fixed first-order theory.

Definition

A class K of structures of a signature σ is called an elementary class if there is a first-order theory T of signature σ, such that K consists of all models of T, i.e., of all σ-structures that satisfy T. If T can be chosen as a theory consisting of a single first-order sentence, then K is called a basic elementary class.

More generally, K is a pseudo-elementary class if there is a first-order theory T of a signature that extends σ, such that K consists of all σ-structures that are reducts to σ of models of T. In other words, a class K of σ-structures is pseudo-elementary iff there is an elementary class K' such that K consists of precisely the reducts to σ of the structures in K'.

For obvious reasons, elementary classes are also called axiomatizable in first-order logic, and basic elementary classes are called finitely axiomatizable in first-order logic. These definitions extend to other logics in the obvious way, but since the first-order case is by far the most important, axiomatizable implicitly refers to this case when no other logic is specified.

Conflicting and alternative terminology

While the above is nowadays standard terminology in "infinite" model theory, the slightly different earlier definitions are still in use in finite model theory, where an elementary class may be called a Δ-elementary class, and the terms elementary class and first-order axiomatizable class are reserved for basic elementary classes (Ebbinghaus et al. 1994, Ebbinghaus and Flum 2005). Hodges calls elementary classes axiomatizable classes, and he refers to basic elementary classes as definable classes. He also uses the respective synonyms EC class and EC class (Hodges, 1993).

There are good reasons for this diverging terminology. The signatures that are considered in general model theory are often infinite, while a single first-order sentence contains only finitely many symbols. Therefore basic elementary classes are atypical in infinite model theory. Finite model theory, on the other hand, deals almost exclusively with finite signatures. It is easy to see that for every finite signature σ and for every class K of σ-structures closed under isomorphism there is an elementary class of σ-structures such that K and contain precisely the same finite structures. Hence elementary classes are not very interesting for finite model theorists.

Easy relations between the notions

Clearly every basic elementary class is an elementary class, and every elementary class is a pseudo-elementary class. Moreover, as an easy consequence of the compactness theorem, a class of σ-structures is basic elementary if and only if it is elementary and its complement is also elementary.

Examples

A basic elementary class

Let σ be a signature consisting only of a unary function symbol f. The class K of σ-structures in which f is one-to-one is a basic elementary class. This is witnessed by the theory T, which consists only of the single sentence

.

An elementary, basic pseudoelementary class that is not basic elementary

Let σ be an arbitrary signature. The class K of all infinite σ-structures is elementary. To see this, consider the sentences

"",
"",

and so on. (So the sentence says that there are at least n elements.) The infinite σ-structures are precisely the models of the theory

.

But K is not a basic elementary class. Otherwise the infinite σ-structures would be precisely those that satisfy a certain first-order sentence τ. But then the set would be inconsistent. By the compactness theorem, for some natural number n the set would be inconsistent. But this is absurd, because this theory is satisfied by any σ-structure with or more elements.

However, there is a basic elementary class K' in the signature σ' = σ {f}, where f is a unary function symbol, such that K consists exactly of the reducts to σ of σ'-structures in K'. K' is axiomatised by the single sentence , which expresses that f is injective but not surjective. Therefore K is elementary and what could be called basic pseudo-elementary, but not basic elementary.

Pseudo-elementary class that is non-elementary

Finally, consider the signature σ consisting of a single unary relation symbol P. Every σ-structure is partitioned into two subsets: Those elements for which P holds, and the rest. Let K be the class of all σ-structures for which these two subsets have the same cardinality, i.e., there is a bijection between them. This class is not elementary, because a σ-structure in which both the set of realisations of P and its complement are countably infinite satisfies precisely the same first-order sentences as a σ-structure in which one of the sets is countably infinite and the other is uncountable.

Now consider the signature , which consists of P along with a unary function symbol f. Let be the class of all -structures such that f is a bijection and P holds for x iff P does not hold for f(x). is clearly an elementary class, and therefore K is an example of a pseudo-elementary class that is not elementary.

Non-pseudo-elementary class

Let σ be an arbitrary signature. The class K of all finite σ-structures is not elementary, because (as shown above) its complement is elementary but not basic elementary. Since this is also true for every signature extending σ, K is not even a pseudo-elementary class.

This example demonstrates the limits of expressive power inherent in first-order logic as opposed to the far more expressive second-order logic. Second-order logic, however, fails to retain many desirable properties of first-order logic, such as the compactness theorem.

References

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    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

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    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

    Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region

    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

    To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010
  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

    Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region

    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

    To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010
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