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I am a beginner in Mathematica. I'd like to do something like the following: enter image description here

write code- ouput- write code- output...

But when I created my own notebook and copy the code above, I don't know how to run them. Shall I download another Wolfram software or what should I do? Thanks a lot.

By the way, I see an orange equal sign on the left each time.

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  • $\begingroup$ You need to evaluate the cells. Press "Shift+Enter" to run the current cell, or you can use any of the other commands under "Evaluation". $\endgroup$
    – Rashid
    Apr 26 '16 at 2:47
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You need to evaluate the cells. You can evaluate the current cell by using "Shift+Enter".

For an introduction to evaluation, here are some helpful references:

  1. Interactive Usage page of The Wolfram Language: Fast Introduction for Programmers.

  2. Practicalities of using the Wolfram Language from An Elementary Introduction to the Wolfram Language by Stephen Wolfram

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