REFERENCES Alves, M. & Artigue, M.& Didirem, E. (1995) Articulation Problems between Different Systems of Symbolic Representations in Linear Algebra. PME, July 22-27, V2. Arshavsky, N. (1999) Concept Formation In Linear Algebra. Rume fourth annual conference, January 18. Carlson, D. (1997) Teaching Linear Algebra: Must the Fog Always Roll in? Resources for Teaching Linear Algebra . MAA notes Volume 42. Pages 39-51. Carlson, D. (1993) The Linear Algebra Curriculum Study Group Recommendations for the first Course in Linear Algebra. The College Mathematics Journal. Vol. 24, No. 1 January 1993. Carlson, M.P (1998) A cross-sectional investigation of the development of function concept. Research in Collegiate Mathematics Education. 3. 114-162. Chang E. R. (1997) The Undergraduate Linear Algebra Curriculum: A view from a Client Discipline, Computer Graphics. Resources for Teaching Linear Algebra . MAA notes Volume 42. Pages 21-26. Clopper, A. (1997) Matrix Algebra in Economics. Resources for Teaching Linear Algebra . MAA notes Volume 42. Pages 17-20. Cobb, P. & Yackel, E. & Wood T. (1992) A constructivist Alternative to The Representational View of Mind In Mathematics Education. Journal for research in mathematics Education. Vol. 23, No, 1,2-33 Davis, B. R. & McKnight, C. (1980) The Influence of Semantic Content on Algorithmic Behavior. The Journal of Mathematical Behavior, V3. Pages 3987. 105 Dubinsky, E. (1997) Some thoughts on a First Course in Linear Algebra at the College Level. Resources for Teaching Linear Algebra . MAA notes Volume 42. Pages 85-106. Edward, B. (1997) An Undergraduate Student's Understanding And Use of Mathematical Definitions In Real Analysis. PME-NA 19 Proceedings, Vol. 1. Erlwanger, S. (1975) Case of Children's Conceptions of Mathematics-Part I. The Journal of children's Mathematical Behavior (JCMB). Vol. 1, No. 3. Summer 1975. Pages 157-183. Galbraith, P. L. (1981) Aspects of Proving: A clinical Investigation of Process. Educational Studies in Mathematics. Vol. 12, Pages 1-28. Hadas, R. (1983) Linguistic Barriers to students’ understanding of Definitions. Proceedings of the Psychology of Mathematics Education: PME, International group for the Psychology of mathematics Education, VIIth Conference, Israel. Harel, G. (1989) Learning and Teaching Linear algebra: Difficulties and an Alternative Approach to visualizing Concepts and Processes. Focuse on learning Problems in mathematics, spring Edition 1989, volume 11: Number 2. Harel, G. (1987) Variation in Linear Algebra Content presentations. Learning of Mathematics. Vol: 7 No:3 Pages: 29-34 For the Harel, G. & Kaput, J. (1991) The role of Conceptual Entities and Their Symbols In Building Advanced Mathematical Concepts. Advanced Mathematical Thinking, Boston, Kluwer Academic Publishers, and pages 82-94. Harel, G. & Tall, D. (1991) The General, the Abstract, and the Generic in Advanced Mathematics. For the Leraning of Mathematics II, 1 (February 1991) FLM Publishing Association. White Rock. British Columbia, Canada. Harel, G. (1997) The Linear Algebra Curriculum Study Group Recommendations: Moving Beyond Concept Definition. Resources for Teaching Linear Algebra . MAA notes Volume 42. Pages 107-126. 106 Harel, G. & Sowder, L. (1998) Students' Proof Schemes: Results from Exploratory Studies. CBMS Issues in Mathematics Education. Vol. 7. Hillel, J. & Sierpinska, A. (1994) On One Persistent Mistake in Linear Algebra. PME 18 Proceedings, Vol III. Hillel, J. & Sierpinska, A. & Trgalova, J. (1999) Teaching and Learning Linear Algebra with Cabri. PME 23 Proceedings. Lester, K. F. (1975) Developmental Aspects of Children's Ability to Understand Mathematical Proof. Journal for Research in Mathematics Education. Vol. 6 Maxwell, S. C. & Delaney, H. D. (1990) Designing experiments and analyzing data. Belmont, CA: Wadsworth. Roberts, L. (1996) Software Activities For Linear Algebra: Concepts and Caveats. PRIMUS June, Volume VI, N.2 Resnick, L. (1989) Conceptual Bases of arithmetic Errors: The Case of Decimal Fractions. Journal for Research in Mathematics Education. Vol. 20, No. 1, 8-27 Rosnick, P. & Clement, J. (1980) Learning Without understanding: The Effect of Tutoring Strategies on Algebra Misconceptions. The Journal of mathematical Behavior, No.1, Vol. 3. Pages 3-27. Tall, D. & Vinner, S. (1981) Concept Images and Concept definition In Mathematics With Particular Reference to Limits and Continuity. Educational Studies in Mathematics. Volume 12 Pages 151-169. Tall, D. (1989) Concept Images Generic Organizers, Computers, and Curriculum Change. For Learning of Mathematics, November 9,3. Toothaker, E. L. & Miller, L. (1996) Introductory Statistics For The Behavioral Sciences, second edition. Tucker, A. (1993) The growing Importance of Linear Algebra in Undergraduate Mathematics. College Mathematics Journal. Vol. 24, No:1, January 1993. 107 Zandieh, M. (1996) The Role of A Formal Definition In Nine Students' Conceptual Image of Derivative. PME-NA 20 Proceedings, Vol. 1. 108