See

http://trac.sagemath.org/sage_trac/ticket/5500

On Mar 17, 2009, at 1:01 AM, chandra wrote:

>
> 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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