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1 Motivation

math3562

an unassuming equation, with a simple graph.

figure3567

The graph and equation are a pair: the graph contains the points for which the equation is satisfied.

Early in school, as our teachers instill into us the logics of mathematics and geometry, we learn various sets of rules for producing graphs of equations. Given a function p we would first generate a table of the values of p(x), for various values of x. An example table, for tex2html_wrap_inline31495 , follows:

figure3605

Table of p(x)

We would then painstakingly plot the points (x,p(x)), secure in the knowledge that these points satisfy the equation y = p(x).

figure3623

We would then draw a line, connecting the points.

figure3704

Glad to be freed from the tedium of plotting points, few question the teacher as to why a line connecting the points may be drawn. During this lesson, the teacher with inquisitive students may well be unlucky, for there is no clear explanation as to why the connecting line may be drawn. It turns out that difficulties arise as this method is applied to general equations.


next up previous notation contents
Next: 1.1 Sampling Up: Generalized Interval Arithmetic M.Sc. Thesis Previous: Contents
Jeff TupperMarch 1996