Mathematica Tutorial for the Physics and Astronomy Department
This is a very short tutorial in using the Steven Wolfram program Mathematica.
The object is to help a user of the P&A computer system
start using this program.
Complete information about mathematica is supplied by the progam itself 
Wolfram's 2000page book Mathematica is included as part of the
online help!
To start, log onto the Unix machine hodge, from a terminal
which supports graphics. You may have to
set the environmental variable DISPLAY to the IP address of the machine
you are on, e.g.:
hodge:madonna% setenv DISPLAY th12313.sfsu.edu:0.0
Start Mathematica:
hodge:madonna% mathematica
After a while you should have a new window for input to Mathematica.
If you get an error message about not being able to open the display,
refer to Remote Graphics Configuration.
Make sure that NUMLOCK is set on your keyboard  keyboard input may not
work without it.
Type in:
4*5
Note that if you press return, nothing happens.
To cause the instruction to be carried out,
press either the enter key on the keypad, or shift return.
Can you guess what the answer will be?
Notice how long it takes Mathematica to figure it out.
This is the program that launched a thousand ships?
(To be fair,
the time elapsed is required to load the Mathematica kernel into memory.
It will be a little faster from now on.)
Now try a graph:
Plot[Sin[x],{x,0,3Pi}]
Did you get a graph? If so, you're done!
Here's an example of how to solve a set of linear equations:
In[4]:= Solve[{a*x+b*y==1,c*x+d*y==5}, {x,y}]
5bd 5a+c
Out[4] = {{x>  _______, y >  _______
bc+ad bc+ad
This is pretty brief. But all the online help in the world is
sitting right there in front of you! Good Luck!
