Name: Dr.Echi, O. E. | Phone: 1802 | Off. Loc: 5-201-4 | Email: echi@kfupm.edu.sa |
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Teaching assignment

# | Course | Section | Period | Location | Activity | Days |
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Office Hours (Phone: Office: )

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Sno | Publications | Year | Status |
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[1] | Othman Echi and Adel Khalfallah. On the prime spectrum of the ring of bounded nonstandard complex numbers. Proc. Amer. Math. Soc. 147 (2019), 687-699. | 2019 | Published |

[2] | Othman Echi and Adel Khalfallah. Order theoretic and topological Characterizations of the Divided Spectrum of a Ring. Bulletin of the Belgian Mathematical Society – Simon Stevin (accepted) | 2019 | Accepted |

[3] | Echi, O. E., "Spectral Primal Spaces," Journal of Algebra and its Applications, 2018. Accepted. |
2018 | Accepted |

[4] | O. E. Echi, "Non-Primitive Words of the Form $pq^m$," RAIRO Theoretical Informatics and Applications, vol. 51, pp. 135-139, 2017. |
2017 | Published |

[5] | Echi, O. E., Lazaar,S, and Oueld Abdallahi, M, "On Some Orthogonal Factorization Systems," Journal of Algebra and its Applications, vol. 14, no. 8, pp. 1-18, 2015. |
2015 | Published |

[6] | P. Bakhtary and O. E. Echi, "On Minimal Hamming Compatible Distances," RAIRO Theoretical Informatics and Applications, vol. 48, pp. 495-503, 2014. |
2014 | Published |

[7] | I. AlRasasi, O. E. Echi, and N. Ghanmi, "On the Korselt Set of a Squarefree Composite Number," Mathematical Reports of the Academy of Science Royal Society of Canada, vol. 35, pp. 1-15, 2013. |
2013 | Published |

[8] | O. Echi and N. Ghanmi, "The Korselt Set of pq," International Journal of Number Theory, vol. 8, pp. 299-309, 2012. |
2012 | Published |

[9] | O.Echi, "The Categories of Flows of Set and Top," Topology and its Applications, vol. 159, pp. 2357-2366, 2012. |
2012 | Published |

[10] | O. Echi and M. Oueld Abdallahi, "On the Spectralification of a Hemispectral Space," Journal of Algebra and its Applications, vol. 10, pp. 687-699, 2011. |
2011 | Published |

[11] | A. Ayache, O. Echi, and M. Naimi, "On Kronecker Polynomials," Rocky Mountain Journal of Mathematics, vol. 41, pp. 707-725, 2011. |
2011 | Published |

[12] | K. Belaid, L. Dridi, and O. Echi, "Submaximal and Door Compactifications," Topology and its Applications, vol. 158, pp. 1969-1975, 2011. |
2011 | Published |

[13] | K. Bouallegue, O. Echi, and P. Richard, "Korselt numbers and sets," International Journal of Number Theory, vol. 6, no. 2, pp. 257-269, Mar. 2010. |
2010 | Published |

[14] | O. Echi and S. Lazaar, "Quasihomeomorphisms and Lattice Equivalent Topological Spaces," Applied General Topology, vol. 10, no. 2, pp. 227-237, 2009. |
2009 | Published |

[15] | O. Echi and S. Lazaar, "Reflective subcategories, Tychonoff Spaces and Spectral Spaces," Topology Proceedings, vol. 34, pp. 307-319, 2009. |
2009 | Published |

[16] | O. Echi, "The Cardinality of a Sphere relative to an Edit Distance," Applied Mathematical Sciences.(Ruse), vol. 3, pp. 813-824, 2009. |
2009 | Published |

[17] | O. Echi and S. Lazaar, "Universal Spaces, Tychonoff and Spectral Spaces," Mathematical Proceedings of the Royal Irish Academy, vol. 109A, pp. 35-48, 2009. |
2009 | Published |

[18] | O. Echi and M. Naimi, "Primitive words and Spectral Spaces," New York Journal of Mathematics, vol. 14, pp. 719-731, 2008. |
2008 | Published |

[19] | M. E. Adams, K. Belaid, L. Dridi, and O. Echi, "Submaximal Spaces and Spectral Spaces," Mathematical Proceedings of the Royal Irish Academy, vol. 108A, pp. 137-147, 2008. |
2008 | Published |

[20] | O. Echi, "Sober Spaces and Sober Sets," Missouri Journal of Mathematical Sciences, vol. 20, pp. 60-72, 2008. |
2008 | Published |

[21] | O. Echi, R. Gargouri, and S. Lazaar, "On the Hochster Dual of a Topological space," Topology Proceedings, vol. 32, pp. 153-166, 2008. |
2008 | Published |

[22] | O. Echi, "Networks of Morphisms," Missouri Journal of Mathematical Sciences, vol. 19, no. 2, pp. 93-105, 2007. |
2007 | Published |

[23] | O. Echi, "Williams Numbers," Mathematical Reports of the Academy of Science Royal Society of Canada, vol. 29, pp. 41-47, 2007. |
2007 | Published |

[24] | A. Ayache, D. E. Dobbs, and O. Echi, "On Maximal non-accp Subrings.," Journal of Algebra and its Applications, vol. 6, no. 5, pp. 873-894, 2007. |
2007 | Published |

[25] | O. Echi, "On $T_D$-spaces," Missouri Journal of Mathematical Sciences, vol. 18, no. 1, pp. 54-60, 2006. |
2006 | Published |

[26] | A. Ayache and O. Echi, "Valuation and Pseudo-valuation Subrings of an Integral Domain," Communications in Algebra, vol. 34, no. 7, pp. 2467-2483, 2006. |
2006 | Published |

[27] | A. Ayache, D. E. Dobbs, and O. Echi, "Reflection of Some Quasi-local Domains," Journal of Algebra and its Applications, vol. 5, no. 2, pp. 201-213, 2006. |
2006 | Published |

[28] | O. Echi, "Binomial Coefficients and Nasir al-Din al-Tusi," Scientific Research and Essay, vol. 1, no. 2, pp. 28-32, 2006. |
2006 | Published |

[29] | A. Ayache, D. E. Dobbs, and O. Echi, "Universal Mapping Properties of some Pseudovaluation Domains and Related Quasilocal Domains," International Journal of Mathematics and Mathematical Sciences, vol. 2006, no. Art. ID 72589, pp. 12 p, 2006. |
2006 | Published |

[30] | A. Ayache and O. Echi, "The Envelope of a Subcategory in Topology and Group Theory," International Journal of Mathematics and Mathematical Sciences, vol. 2005, no. 21, pp. 201-213, 2005. |
2005 | Published |

[31] | O. Echi and M. Ito, "Up-spectral Spaces and A-spectral Spaces," Questions and Answers in General Topology, vol. 23, no. 1, pp. 15-26, 2005. |
2005 | Published |

[32] | K. Belaid, O. Echi, and R. Gargouri, "Two Classes of Locally Compact Sober Spaces.," International Journal of Mathematics and Mathematical Sciences, vol. 2005, no. 15, pp. 2421-2427, 2005. |
2005 | Published |

[33] | K. Belaid, O. Echi, and R. Gargouri, "A-spectral Spaces," Topology and its Applications, vol. 138, no. 1-3, pp. 315-322, 2004. |
2004 | Published |

[34] | O. Echi and R. Gargouri, "An Up-spectral Space Need not be A-spectral," New York Journal of Mathematics, vol. 10, pp. 271-277, 2004. |
2004 | Published |

[35] | K. Belaid, O. Echi, and S. Lazaar, "T(Î±,Î²)-spaces and the Wallman Compactification," International Journal of Mathematics and Mathematical Sciences, vol. 2004, no. 65-68, pp. 3717-3735, 2004. |
2004 | Published |

[36] | K. Belaid and O. Echi, "On a Conjecture about Spectral Sets," Topology and its Applications, vol. 139, no. 1-3, pp. 1-15, 2004. |
2004 | Published |

[37] | O. Echi, "Quasi-homeomorphisms, Goldspectral Spaces and Jacspectral Spaces," Bollettino della Unione Matematica Italiana, vol. (8) 6, pp. 489-507, 2003. |
2003 | Published |

[38] | O. Echi, "Topological Characterizations of Some Subspaces of a Spectral Space," Questions and Answers in General Topology, vol. 21, no. 2, pp. 109-123, 2003. |
2003 | Published |

[39] | E. Bouacida, O. Echi, G. Picavet, and E. Salhi, "An Extension Theorem for Sober Spaces and the Goldman Topology," International Journal of Mathematics and Mathematical Sciences, vol. 51, pp. 3217-3239, 2003. |
2003 | Published |

[40] | O. Echi and N. Jarboui, "On Residually Integrally Closed Domains," Demonstratio Mathematica, vol. 36, no. 3, pp. 543-550, 2003. |
2003 | Published |

[41] | A. Ayache, M. Ben Nasr, O. Echi, and N. Jarboui, "Universally Catenarian and Going-down Pairs of Rings," Mathematische Zeitschrift, vol. 238, no. 4, pp. 695-731, 2001. |
2001 | Published |

[42] | M. Ben Nasr, O. Echi, L. Izelgue, and N. Jarboui, "Pairs of Domains where all Intermediate Domains are Jaffard," Journal of Pure and Applied Algebra, vol. 145, no. 1, pp. 1-18, 2000. |
2000 | Published |

[43] | K. Belaid, B. Cherif, and O. Echi, "Quasi-spectral Binary Relations and Ordered Disjoint Unions," Journal of Mathematical Sciences (Calcutta), vol. 11, no. 2, pp. 139-157, 2000. |
2000 | Published |

[44] | E. Bouacida, O. Echi, and E. Salhi, "Feuilletages et Topologie Spectrale," Journal of Mathematical Society of Japan, vol. 52, no. 2, pp. 447-464, 2000. |
2000 | Published |

[45] | S. Ameziane, O. Echi, and I. Yengui, "Direct Systems of Localizations of Polynomial Rings," Acta Scientiarum Mathematicarum (Szeged), vol. 66, no. 3-4, pp. 465-476, 2000. |
2000 | Published |

[46] | O. Echi, "A Topological Characterization of the Goldman Prime Spectrum of a Commutative Ring," Communications in Algebra, vol. 28, no. 5, pp. 2329-2337, 2000. |
2000 | Published |

[47] | E. Bouacida, O. Echi, and E. Salhi, "Foliations, Spectral Topology, and Special Morphisms," Lecture Notes in Pure and Applied Mathematics, vol. 205, pp. 111-132, 1997. |
1997 | Published |

[48] | E. Bouacida, O. Echi, and E. Salhi, "Nonfinite Heights," Lecture Notes in Pure and Applied Mathematics, vol. 185, pp. 113-130, 1997. |
1997 | Published |

[49] | K. Belaid, B. Cherif, and O. Echi, "On Spectral Binary Relations," Lecture Notes in Pure and Applied Mathematics, vol. 185, pp. 79-88, 1997. |
1997 | Published |

[50] | E. Bouacida, O. Echi, and E. Salhi, "Topologies Associ\'es \`a une Relation Binaire et Relation Binaire Spectrale," Bollettino della Unione Matematica Italiana, vol. B (7) 10, pp. 417-439, 1996. |
1996 | Published |

[51] | A. Ayache, P. J. Cahen, and O. Echi, "Anneaux Quasi-pr\"uf\'eriens et $P$-anneaux.," Bollettino della Unione Matematica Italiana, vol. B (7) 10, pp. 1-24, 1996. |
1996 | Published |

[52] | A. Ayache, P. J. Cahen, and O. Echi, "Valuative Heights and Infinite Nagata Rings," Communications in Algebra, vol. 23, no. 5, pp. 1913-1926, 1995. |
1995 | Published |

[53] | O. Echi, "Sur les Hauteurs Valuatives," Bollettino della Unione Matematica Italiana, vol. B(7)9, pp. 281-297, 1995. |
1995 | Published |

[54] | O. Echi, "The altitude formula," Lecture Notes in Pure and Applied Mathematics, no. 153, pp. 99-103, 1994. |
1994 | Published |

[55] | O. Echi, "Transfert de la Notion de $C$-anneaux aux Produits Fibr\'es," Portugaliae Mathematica, vol. 51, no. 1, pp. 13-23, 1994. |
1994 | Published |

[56] | A. Ayache, P. J. Cahen, and O. Echi, "Intersection de Produits Fibr\'es et Formule de la Dimension," Communications in Algebra, vol. 22, no. 9, pp. 3495-3509, 1994. |
1994 | Published |

[57] | O. Echi, "$C$-anneaux, $E$-anneaux et Formule de la Dimension," Portugaliae Mathematica, vol. 50, no. 3, pp. 277-295, 1993. |
1993 | Published |

# | Title | PI/Coordinaor | Members | Sponsor | Grant | Ref # | S-Date | E-Date | Month | Status |
---|---|---|---|---|---|---|---|---|---|---|

1 | Unifying Zariski-like Topologies for Modules | J. Y. Abuihlail | O. E. Echi | KFUPM | Research Group | RG1213 | Jun 2012 | Jun 2015 | 36 | In Progress |

Course | Section | Semester | F1,F2.. :Final Exams, E1,E2..:Majors Q1,.. :Quizzes H1,.. : Homework& S1,.: Syllabus |
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MATH202 | 13 | 182 | |

MATH202 | 18 | 182 | |

MATH101 | 24 | 181 | |

MATH101 | 31 | 181 | |

MATH225 | 01 | 181 | F1 E1 E2 E3 |

MATH202 | 01 | 172 | E1 E2 Q1 Q2 Q3 |

MATH202 | 02 | 172 | Q1 Q2 Q3 |

MATH202 | 04 | 172 | Q1 Q2 Q3 |

MATH596 | 01 | 172 | |

MATH102 | 04 | 171 | Q1 Q2 Q3 Q4 Q5 Q6 |

MATH102 | 14 | 171 | Q1 Q2 Q3 Q4 Q5 Q6 |

MATH202 | 13 | 162 | Q1 Q2 Q3 Q4 Q5 Q6 |

MATH345 | 02 | 162 | F1 E1 E2 S1 |

MATH232 | 02 | 161 | F1 E1 E2 Q1 Q2 Q3 S1 |

MATH260 | 02 | 161 | E1 Q1 Q2 Q3 Q4 E2 F1 |

MATH202 | 09 | 152 | Q1 Q2 Q3 Q4 |

MATH232 | 01 | 152 | F1 E1 E2 E3 E4 S1 |

MATH202 | 03 | 151 | Q1 Q2 Q3 Q4 Q5 |

MATH232 | 01 | 151 | F1 E1 E2 O1 O2 |

MATH202 | 12 | 142 | Q1 Q2 Q3 Q4 Q5 S1 |

MATH232 | 01 | 142 | F1 E1 E2 Q1 Q2 S1 |

MATH101 | 30 | 141 | Q1 Q2 Q3 Q4 |

MATH421 | 01 | 141 | F1 E1 E2 |

MATH280 | 01 | 132 | F1 E1 E2 E3 S1 |

MATH521 | 01 | 132 | F1 E1 S1 |

MATH302 | 04 | 131 | F1 E1 E2 Q1 Q2 Q3 Q4 Q5 Q6 S1 |

MATH555 | 01 | 131 | F1 E1 S1 |

MATH302 | 03 | 122 | S1 Q1 Q2 Q3 Q4 Q5 F1 E1 E2 |

MATH302 | 05 | 122 | F1 E1 E2 Q1 Q2 Q3 Q4 Q5 S1 |

MATH232 | 01 | 121 | F1 Q1 Q2 Q3 Q4 S1 |

MATH302 | 02 | 121 | E1 E2 Q1 Q2 Q3 Q4 S1 |

MATH260 | 01 | 112 | F1 E1 E2 S1 Q1 Q2 Q3 Q4 |

MATH260 | 02 | 112 | Q1 Q2 Q3 Q4 F1 |

MATH302 | 01 | 111 | F1 E1 E2 Q1 Q2 Q3 Q4 Q5 Q6 S1 |

MATH302 | 03 | 111 | F1 E1 E2 Q1 Q2 Q3 Q4 Q5 Q6 S1 |

MATH302 | 01 | 102 | F1 E1 E2 Q1 Q2 Q3 |

MATH345 | 01 | 102 | F1 E1 E2 S1 |

MATH302 | 02 | 101 | F1 E1 E2 S1 Q1 Q2 Q3 Q4 Q5 Q6 Q7 |

MATH302 | 04 | 101 | F1 E1 E2 Q1 Q2 Q3 Q5 S1 Q6 Q7 Q4 |

MATH302 | 02 | 092 | Q1 Q2 Q3 Q4 Q5 Q6 S1 |

MATH551 | 01 | 092 | S1 E1 E2 E3 |

MATH101 | 08 | 091 | S1 H1 Q1 Q2 H2 H3 Q3 Q4 O1 E1 E2 F1 |

MATH302 | 02 | 091 | S1 H1 Q1 Q2 Q3 Q4 E2 O1 F1 |

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