Revision history [back]

First of all, there is a difference between Python variables and symbolic variables. If you write

x = 3

You are initializing a Python variable (whose values is an int). When you do

var('x')

you tell the function var to declar a Python variable x whose value is an unknown named x (what is called a variable in mathematics). In other words, you should start with

var('y u v')

Vincent