It is essential that there is no text in an input cell. To change the style of a cell: click the cell bracket this highlights the bracket then choose style from the menu item Format -> Style Then click and a cell insertion bar will appear. Make sure that the pointer becomes a horizontal I-beam. To add a new cell place the pointer in the notebook window below the last cell.
Notice that the thin blue brackets of the input and output cells have differently designed tops. The result will appear in an output cell. This tells Mathematica to process your input. After writing 2+2, hold down the Shift key and press Enter (this is abbreviated as Shift+Enter). Start writing something simple, 2+2 for example. As you start writing in a blank notebook Mathematica forms a cell a thin blue frame will appear on the right of the notebook window. When Mathematica starts up, it gives you a blank Mathematica file. Start -> Programs -> Wolfram Mathematica -> Mathematica 12 You will find Mathematica 12 as follows (this sequence might differ on different campus computers) You need to find a campus computer with Mathematica 12 installed on it (for example computers in BH 215).
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