Using the graphic display calculator in solving some problems concerning limits of sequences and functions

Limits are one of the most fundamental and important concepts of calculus, because having a proper understanding of this concept is a prerequisite for understanding such concepts as continuity, differentiation, and integration. Thus, researchers and teachers seem to outdo one another in looking for the best methods of introducing limits. One of the methods is using IT and graphic software to illustrate the idea of limits. It Seems that such a method, while useful, is overflowing with the risk of making mistakes and strengthening the improper understanding of these basic concepts. The aim of this paper is to present how students who use graphic display calculators understand the limits of sequences and functions, before introducing the theoretic and algebraic methods required for solving limits, and what dangers can be caused by using a GDC in this process.