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Re: How to Clear y'[0]


"Jean-Marc Gulliet" <jeanmarc.gulliet at 9online.fr> wrote in message 
news:d6p1n9$i8g$1 at smc.vnet.net...
> Hi Joseph,
>
> Enter "y[0]=." to clear the definition of y[0].
>
> In[42]:=
> y[0]=.
>
> In[44]:=
> DSolve[{y''[t]\[Equal]y[t],y[0]==1},y,t]
>
> Out[44]//InputForm=
> {{y -> Function[{t},
>     -((-E^(2*t) - C[2] + E^(2*t)*C[2])/E^t)]}}
>
> Best regards,
> /J.M.
Thank you; works exactly as you said.
Joseph 



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