Click Start, point to All Programs, and choose Mathematica 5.1 from the Mathematica 5.1 program group.
On Mac OS X:
Double-click the Mathematica 5.1 icon. If you have placed it in the Dock, you can single-click to launch from there.
On Unix or Linux:
In a shell, type
Here is a typical screen after startup.
On the left is a new notebook.
On the right is the Basic Input palette. You can use the Basic Input palette to enter common mathematical symbols and notation.
Click a button in the Startup palette to watch the introductory tutorial, open the Help Browser, or visit the Wolfram Research home page.
First steps with Mathematica...
Type 2+2 and then press (hold down the SHIFT key and press ENTER) to tell Mathematica to evaluate your input.
Labels are added automatically.
Output is placed below the input.
Your first calculation will take longer than subsequent calculations because the Mathematica kernel has to start up.
Mathematica is made of two parts: a kernel and a front end. The kernel is the part that does calculations. The front end is the part that handles notebooks and interaction with the user.
On the Macintosh, is equivalent to .
On extended keyboards, you can use the key at the lower right corner of the numeric keypad to evaluate your input. Pressing the key in the main keypad by itself gives you a new line in the same cell. See Working with Cells and Notebooks for a discussion of cells.
You can run the kernel directly from a command line; see Special Ways to Run the Kernel to find out how.