Hi Frank?
Declares s to be positive, that certainly does it in Derive 5
either author
S:epsilon Real(0,inf)
or go throught Declare: Variable domain option in the menu
Don't forget the Derive-TI89/92 conference in Liverpool, UK 12th-15th July
2000
htpp://www.cms.livjm.ac.uk/derive2k
Cheers
Terence
Terence Etchells B.Sc., M.Sc., C.Math, MIMA
School of Computing & Mathematical Sciences
Liverpool John Moores University
Liverpool
L3 3AF
> -----Original Message-----
> From: Frank Besig [mailto:[log in to unmask]]
> Sent: 23 March 2000 21:52
> To: [log in to unmask]
> Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]
> Subject: Laplace Transform Query
>
>
> Declaring and Authoring the following in DERIVE for Windows 4.0:
>
> s = Real (a, inf)
> a = Real (0, inf)
> LAPLACE(SIN(a·t), t, s)
>
> yields, on simplification:
>
> - inf·SIGN(s)
> * ·(a + s)·SIN(inf) a
> ŻŻŻŻŻŻŻŻŻŻ + ŻŻŻŻŻŻ
>
> a^2 + s^2 a^2 + s^2
>
> We would like to get simply (a/(a^2 + s^2)). Is there a way to achieve
> this ?
>
>
>
>
>
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