Hi there,
I got a problem with solving equations using Mathematica recently. I typed in Solve[an equation], it always show up "Expression cannot begin with xxx". (As shown in the image attached)
Does anyone know how to deal with it?
Thanks!
http://reference.wolfram.com/language/tutorial/TheFourKindsOfBracketingInTheWolframLanguage.html
http://reference.wolfram.com/language/tutorial/TheSyntaxOfTheWolframLanguage.html
The [ ] pairs around BesselJ. Also, you don't need Solve.
In[3]:= Integrate[(BesselJ[0, a*r])^2*r, {r, 0, R}] Out[3]= 1/2 R^2 (BesselJ[0, a R]^2 + BesselJ[1, a R]^2)
You're using [...] where you should be using (...)
[ ] should contain function arguments.
Which [] do you mean?
I figured it out! Thanks for everyone!
Best,
