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2021-03-09 15:03:34 +0100 commented answer The variable cannot be assigned a number

Hi Emmnuel, thanks very much. I must digest your information first! :)

2021-03-05 15:14:45 +0100 commented answer The variable cannot be assigned a number

Thanks for your reply. Yes, indeed, I kind of understand the problem. I am quite new to sage, and whta you said makes se

2021-03-05 10:50:35 +0100 received badge  Student (source)
2021-03-05 00:22:17 +0100 asked a question The variable cannot be assigned a number

The varible cannot be assigned a number Helllo all, I simplify the codes as below: var("T t kx A") w=2*pi/T