problem with solving a simple third order differential equation

Asked Aug 06 '20 at 14:45

Active Aug 06 '20 at 16:49

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I just wrote a simple line of code to solve a third-order differential equation:

DSolve[{y'''[x] + 4*y[x]==0, y[0]==1, y'[0]==2, y''[0]==0}, y[x], x]

Then Mathematica said:

Could you please tell me what I did wrong? Thanks

asked Aug 06 '20 at 14:45

Shan

3

My guess is it cached something from an incorrect syntax, so restart your kernel or clear everything because I copied and pasted your stuff and it worked. – Moo Aug 06 '20 at 15:25
Execute this: ClearAll["`"]; Remove["`*"]; and next: DSolve – Mariusz Iwaniuk Aug 06 '20 at 16:18
@Ma That won't work, it's Derivative that's polluted. – xzczd Aug 06 '20 at 16:47

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