Tarek Sayed Ahmed

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Person:227768

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zbMath Open sayed-ahmed.tarekMaRDI QIDQ227768

List of research outcomes

PublicationDate of PublicationType
Complete Representations and Neat Embeddings2024-02-29Paper
Omitting types algebraically and more about amalgamation for modal cylindric algebras2023-09-12Paper
Notions of representability for cylindric algebras: some algebras are more representable than others2023-06-05Paper
Omitting Types in Fragments and Extensions of First Order Logic2023-05-04Paper
On Complete Representations and Minimal Completions in Algebraic Logic, Both Positive and Negative Results2023-05-04Paper
https://portal.mardi4nfdi.de/entity/Q50739422022-05-06Paper
DIAGONALIZATION EXHIBITED IN THE LIAR PARADOX, RUSSELL’S PARADOX AND GÖDEL’S INCOMPLETENESS THEOREM2022-05-06Paper
Blow Up and Blur Constructions in Algebraic Logic2021-12-10Paper
Existence of certain finite relation algebras implies failure of omitting types for \(L_n\)2021-09-07Paper
Atom-canonicity in varieties of cylindric algebras with applications to omitting types in multi-modal logic2021-06-25Paper
Atom canonicity and first order definability in classes of algebras of relations2021-03-20Paper
Interpolation and amalgamation in modal cylindric algebras2021-02-08Paper
A brief history of Tarskian algebraic logic with new perspectives and innovations2020-08-25Paper
Space and time via Topological and Tense cylindric algebras2020-05-18Paper
Geometrical representation theorems for cylindric-type algebras2020-02-10Paper
Completely representable neat reducts2020-01-28Paper
An infinite stratum of representability; some cylindric algebras are more representable than others2020-01-27Paper
On the multi-dimensional modal logic of substitutions2020-01-17Paper
A universal approach to Omitting types for various multimodal and quantifier logics2019-12-14Paper
Non elementary classes of relation and cylindric algebras2019-12-14Paper
Various notions of represetability for cylindric and polyadic algebras2019-11-21Paper
Hilbert's tenth problem, G\"odel's incompleteness, Halting problem, a unifying perspective2018-12-02Paper
Varying interpolation and amalgamation in polyadic MV-algebras2018-09-12Paper
Yet some more non-finite axiomatizability results for algebras of relations and ways to avoid them2017-08-25Paper
Neat embeddings as adjoint situations2017-03-09Paper
Atom-canonicity in algebraic logic in connection to omitting types in modal fragments of L_{\omega, \omega}2016-08-10Paper
On notions of representability for cylindric‐polyadic algebras, and a solution to the finitizability problem for quantifier logics with equality2016-01-07Paper
A brief history of algebraic logic from neat embeddings to rainbow constructions2015-08-21Paper
Finite relation algebras and omitting types in modal fragments of first order logic2015-04-22Paper
Splitting methods in algebraic logic: Proving results on non-atom-canonicity, non-finite axiomatizability and non-first oder definability for cylindric and relation algebras2015-03-07Paper
A solution to the finitizability problem for quantifier logics with equality2015-03-01Paper
Problems on neat embeddings solved by rainbow constructions and Monk algebras2015-02-02Paper
The class of completely representable polyadic algebras of infinite dimensions is elementary2015-01-09Paper
THE NEAT EMBEDDING PROBLEM FOR ALGEBRAS OTHER THAN CYLINDRIC ALGEBRAS AND FOR INFINITE DIMENSIONS2014-09-30Paper
Atom-canonicity and complete representations for cylindric-like algebras, and omitting types for the clque guarded fragment of first order logic2014-06-25Paper
A non representable infinite dimensional quasi-polyadic equality algebra with a representable cylindric reduct2014-05-05Paper
https://portal.mardi4nfdi.de/entity/Q54114022014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114032014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114222014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114232014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114242014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114282014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114292014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114302014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114472014-04-23Paper
https://portal.mardi4nfdi.de/entity/Q54114732014-04-23Paper
Algebraic analysis of temporal and topological finite variable fragments, using cylindric modal algebras2014-02-02Paper
Amalgamation, interpolation and congruence extension properties in topological cylindric algebras2014-01-27Paper
Algebraisable versions of predicate topological logic2014-01-06Paper
Dedekind completions, neat embeddings and omitting types2014-01-02Paper
https://portal.mardi4nfdi.de/entity/Q28537102013-10-16Paper
https://portal.mardi4nfdi.de/entity/Q28537112013-10-16Paper
https://portal.mardi4nfdi.de/entity/Q28537152013-10-16Paper
Cylindric and polyadic algebras, new perspectives2013-08-31Paper
Atom-canonicity, relativized representations and omitting types for clique guarded semantics and guarded logics2013-08-27Paper
Strongly representable atom structures and neat embeddings2013-07-14Paper
On completions, neat embeddings and omittings types, yet again2013-07-02Paper
For finite n\geq 3, and k\geq 4, the variety SNr_n\CA_{n+k} is not atom canonical2013-06-04Paper
A polyadic algebra of infinite dimension is completely representable if and only if it is atomic and completely additive2013-06-04Paper
There is no finite variable axiomatization for various diagonal free algebras2013-05-29Paper
Blowing up and blurring finite Monk and rainbow algebras2013-05-20Paper
Strongly representable algebras2013-04-25Paper
Various interplays between relation and cylindric algebras2013-04-25Paper
On atomicity of free algebras in Boolean algebras with operators, and a new result on Pinter's free algebras2013-04-23Paper
On neat atom structures for cylindric like algebras2013-04-23Paper
https://portal.mardi4nfdi.de/entity/Q49162832013-04-22Paper
Strongly representable atom structures2013-04-19Paper
Blow up and Blur constructions in Algebraic Logic2013-04-17Paper
Three interpolation theorems for typeless logics2013-04-17Paper
On completions of algebras in SNr_nCA_{n+k}, n\geq 3, k\geq 12013-04-11Paper
The elementary closure of the class Nr_nCA_m for m\geq n+1 is not finitely axiomatizable, futhermore for any finite k\geq 1, there is A\in Nr_{\omega}CA_{\omeg+k}that is not SNr_{\omega}CA_{\omega+k+1}2013-04-09Paper
Logics to which the class of neat reducts is sensitive to2013-04-09Paper
Results on Polyadic Algebras2013-04-09Paper
Building relativized representations using games2013-04-04Paper
Polyadic-like algebras without the amalgamation property2013-04-04Paper
On finitely generated reducts of polyadic equality algebras2013-04-04Paper
Amalgmation in Boolean algebras with operators2013-04-04Paper
Completeness and interpolation for intuitionistic infinitary predicate logic, in connection to finitizing the class of representable Heyting polyadic algebras2013-04-04Paper
An instance of Vaught's conjecture using algebraic logic2013-04-03Paper
Representation theorems in modal logic using algebraic logic2013-04-03Paper
Free algebras, amalgamation, and a theorem of Vaught for many valued logics2013-04-03Paper
On some open problems in Algebraic logic2013-04-03Paper
Some metalogical properties for infinitary predicate topological logic2013-04-03Paper
Representations of bounded distributive lattices as the continuous sections of Sheaves based on the Priestly and Zarski topologies2013-04-02Paper
On complete representability of Pinter's algebras and related structures2013-04-02Paper
The superamalgamation property for reducts of Heyting polyadic algebras with and without equality2013-04-02Paper
Characterizing amalgmation bases for relation, cylindric and polyadic algebras2013-04-02Paper
Cylindric polyadic algebras have the superamalgamation2013-04-02Paper
Interpolation in many valued predicate logics using algebraic logic2013-04-02Paper
Quasi-projective relation algebras and directed cylindric algebras are categorially equivalent2013-04-02Paper
Neat atom structures2013-04-02Paper
What is the spirit of the cylindric paradigm, as opposed to that of the polyadic one?2013-03-29Paper
On the finitizability problem in algebraic logic; recent results2013-02-06Paper
The class of infinite dimensional quasipolaydic equality algebras is not finitely axiomatizable over its diagonal free reducts2013-02-02Paper
Atomic polyadic algebras of infinite dimension are completely representable2013-01-24Paper
New perspectives in algebraic logic, from neat embeddings to Erdős graphs2012-09-13Paper
Epimorphisms are not surjective, even in simple algebras2012-08-01Paper
https://portal.mardi4nfdi.de/entity/Q28899542012-06-08Paper
Representability and amalgamation for Heyting polyadic algebras2012-04-26Paper
Amalgamation in universal algebraic logic2012-04-26Paper
https://portal.mardi4nfdi.de/entity/Q31041252011-12-19Paper
https://portal.mardi4nfdi.de/entity/Q31041442011-12-19Paper
On the complexity of axiomatizations of the class of representable quasi-polyadic equality algebras2011-09-27Paper
https://portal.mardi4nfdi.de/entity/Q30914172011-09-09Paper
https://portal.mardi4nfdi.de/entity/Q30914272011-09-09Paper
https://portal.mardi4nfdi.de/entity/Q30032102011-05-25Paper
https://portal.mardi4nfdi.de/entity/Q29969692011-05-04Paper
https://portal.mardi4nfdi.de/entity/Q53931892011-04-15Paper
Classes of algebras without the amalgamation property2011-03-07Paper
https://portal.mardi4nfdi.de/entity/Q30679802011-01-13Paper
https://portal.mardi4nfdi.de/entity/Q30641302010-12-20Paper
Some results about neat reducts2010-09-08Paper
The class of polyadic algebras has the super amalgamation property2010-02-16Paper
Epimorphisms in cylindric algebras and definability in finite variable logic2010-01-04Paper
Neat reducts and amalgamation in retrospect, a survey of results and some methods Part II: Results on amalgamation2009-12-18Paper
https://portal.mardi4nfdi.de/entity/Q36508582009-12-15Paper
https://portal.mardi4nfdi.de/entity/Q36508592009-12-15Paper
On neat embeddings of cylindric algebras2009-12-14Paper
Omitting types for algebraizable extensions of first order logic2009-11-30Paper
On a theorem of Vaught for first order logic with finitely many variables2009-11-30Paper
https://portal.mardi4nfdi.de/entity/Q31850152009-10-23Paper
Neat reducts and amalgamation in retrospect, a survey of results and some methods Part I: Results on neat reducts2009-08-12Paper
https://portal.mardi4nfdi.de/entity/Q51922622009-08-04Paper
https://portal.mardi4nfdi.de/entity/Q51922642009-08-04Paper
https://portal.mardi4nfdi.de/entity/Q51922862009-08-04Paper
On complete representations of algebras of logic2009-06-29Paper
A simple construction of representable relation algebras with non-representable completions2009-06-11Paper
A note on substitutions in representable cylindric algebras2009-06-11Paper
https://portal.mardi4nfdi.de/entity/Q36292322009-05-27Paper
https://portal.mardi4nfdi.de/entity/Q36290412009-05-26Paper
https://portal.mardi4nfdi.de/entity/Q36187462009-04-02Paper
https://portal.mardi4nfdi.de/entity/Q36187532009-04-02Paper
https://portal.mardi4nfdi.de/entity/Q36187542009-04-02Paper
On complete representations of reducts of polyadic algebras2009-03-17Paper
The Class SNr3CAk is Not Closed Under Completions2008-12-05Paper
Weakly representable atom structures that are not strongly representable, with an application to first order logic2008-06-12Paper
Omitting types for finite variable fragments and complete representations of algebras2008-05-08Paper
https://portal.mardi4nfdi.de/entity/Q54601612008-05-02Paper
https://portal.mardi4nfdi.de/entity/Q54601732008-05-02Paper
An Omitting Types Theorem for first order logic with infinitary relation symbols2008-01-04Paper
A note on neat reducts2007-08-17Paper
An Interpolation Theorem for First Order Logic with Infinitary Predicates2007-05-18Paper
On Neat Reducts and Amalgamation2007-05-18Paper
A Neat Embedding Theorem for Expansions of Cylindric Algebras2007-05-18Paper
https://portal.mardi4nfdi.de/entity/Q34331752007-04-27Paper
https://portal.mardi4nfdi.de/entity/Q34331782007-04-27Paper
https://portal.mardi4nfdi.de/entity/Q34352322007-04-25Paper
https://portal.mardi4nfdi.de/entity/Q34352332007-04-25Paper
Some Results on Amalgamation in Algebraic Logic2007-04-19Paper
Amalgamation, interpolation and epimorphisms in algebraic logic2007-04-02Paper
Independence Results in Algebraic Logic2006-07-06Paper
Algebraic Logic, Where Does it Stand Today?2006-06-12Paper
The class of infinite dimensional neat reducts of quasi-polyadic algebras is not axiomatizable2006-03-24Paper
On amalgamation in algebras of logic2006-03-17Paper
On amalgamation of reducts of polyadic algebras2006-01-17Paper
Amalgamation Theorems in Algebraic Logic, an overview2005-10-18Paper
Neat embeddings, omitting types, and interpolation: an overview2005-07-13Paper
Martin's axiom, omitting types, and complete representations in algebraic logic2003-03-12Paper
https://portal.mardi4nfdi.de/entity/Q45301452002-07-24Paper
The class of neat reducts is not elementary2002-07-22Paper
On neat reducts of algebras of logic2002-05-22Paper
The class of 2-dimensional neat reducts is not elementary2002-02-21Paper

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