Windows lightweight Math Software I'm looking for lightweight, free, Windows, Math software.
Something I can put an expression and get an answer, or graph it.
I tried Euler, but it is quiet complicated and HUGE.
Basic needs:


*

*Expression Based

*Supports Variables

*Support Functions, User defined and auto loaded.

*Supports graphs, 2D.  Not really needing 3D.

*Supports History.


What do you use?  What do you recommend?

You can try PARI/GP
I am more fan of sage but currently it doesn't natively support your OS, you can try it in a virtual machine.
