On Mar 17, 1:47 am, William Stein <wst...@gmail.com> wrote:
> I think simply appending a text file of changes to this list would be
> fine for starters.
>
> William
OK. Here is my list so far:
====
Suggested Amendments to Sage Tutorial (Sage 3.4)
1. Functions, Indentation, and Counting
After
sage: def is_even(n):
... return n%2 == 0
Add
Press [Return/Enter] once to insert a blank line and conclude the
function definition.
Also state that this instruction will not be repeated later, but that
all function definitions must be terminated by a blank line.
2. Solving Differential Equations
The pair of equations written on a single line below:
m_1 x_1'' + (k_1+k_2) x_1 - k_2 x_2 = 0 m_2 x_2''+ k_2 (x_2-x_1) = 0,
would be better understood as as a pair stacked on top of each other:
m_1 x_1'' + (k_1+k_2) x_1 - k_2 x_2 = 0
m_2 x_2''+ k_2 (x_2-x_1) = 0
Also, the line
(with the notation x=x_{1}, y=x_{2}:
should have a closing, right parenthesis:
(with the notation x=x_{1}, y=x_{2}):
3. Two-dimensional Plots
The code
polygon(L, rgbcolor=(1/8,3/4,1/2))
should read
p = polygon(L, rgbcolor=(1/8,3/4,1/2))
so that the next line that asks us to type
show(p, axes=false)
does not generate an error.
4. Basic Rings
When introducing i for I, it is advisable to clear the variable
namespace for I got the value 199 when I typed i. I had to restart
sage before I got i as a synonym for I. I do not know what caused This
behaviour or how to replicate it.
====
Thanks.
Chandra
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